That's fine, but you haven't demonstrated as much. That's all I'm saying. Your illustration was supposed to be doing that but it can't on it's own.
My post was part of a thread I started in Non Denominational Forum (which in itself was abbreviated from another study I did)- I probably should have copied and pasted the whole post to start off with. I had just intended it to augment arguments already forwarded. In my initial study (handwritten) I had the 2 Kings passages at the end as a part of the conclusion, which on balance was probably a better place for them. Here iis the post from the Non-Denom forum (except for the opening few paragraphs):
From the start it is necessary to point out that in the contexts we are considering, the terms law and covenant are different terms but apply to the same thing, consider the usages of the words in the following verses:
2 Kings 22:8
Then Hilkiah the high priest said to Shaphan the scribe, I have found the Book of the Law in the house of the Lord.
In the next chapter the book is referred to in different terms:
2 Kings 23:2
The king went up to the house of the Lord with all the men of Judah, and with him all the inhabitants of Jerusalemthe priests and the prophets and all the people, both small and great. And he read in their hearing all the words of the Book of the Covenant which had been found in the house of the Lord.
It is clear the terms "law" and "covenant" are equivalent terms. 
Now regarding the Old Covenant, the scriptures are quite clear. Consider the following passages:
2nd Corinthians 3:1-7
2 You are our epistle written in our hearts, known and read by all men; 3 clearly you are an epistle of Christ, ministered by us, written not with ink but by the Spirit of the living God, not on tablets of stone but on tablets of flesh, that is, of the heart. 4 And we have such trust through Christ toward God. 5 Not that we are sufficient of ourselves to think of anything as being from ourselves, but our sufficiency is from God, 6 who also made us sufficient as ministers of the new covenant, not of the letter but of the Spirit; for the letter kills, but the Spirit gives life. 7 But if the ministry of death, written and engraved on stones, was glorious, so that the children of Israel could not look steadily at the face of Moses because of the glory of his countenance, which glory was passing away, 8 how will the ministry of the Spirit not be more glorious?
The New Covenant is that which gives life and by necessary inference the Old covenant is the ministry of death written and engraved on stones - an obvious reference to the ten commandments. The New Covenant is more glorious than the old one.
Galatians 3 (some verses left out so this will fit in one post)
 9 So then those who are of faith are blessed with believing Abraham.10 For as many as are of the works of the law are under the curse; for it is written, Cursed is everyone who does not continue in all things which are written in the book of the law, to do them. 11 But that no one is justified by the law in the sight of God is evident, for the just shall live by faith. 12 Yet the law is not of faith, but the man who does them shall live by them.
13 Christ has redeemed us from the curse of the law, having become a curse for us (for it is written, Cursed is everyone who hangs on a tree)...
19 What purpose then does the law serve? It was added because of transgressions, till the Seed should come to whom the promise was made; and it was appointed through angels by the hand of a mediator. 20 Now a mediator does not mediate for one only, but God is one.
21 Is the law then against the promises of God? Certainly not! For if there had been a law given which could have given life, truly righteousness would have been by the law. 22 But the Scripture has confined all under sin, that the promise by faith in Jesus Christ might be given to those who believe.
The law was "until Christ", he then redeemed it from its curse, which was that it could not justify us. It confined all under sin, thus showing our need for a saviour. The law was to be until the seed (Jesus) came.
Galatians 3 goes on to say:
But before faith came, we were kept under guard by the law, kept for the faith which would afterward be revealed. 24 Therefore the law was our tutor to bring us to Christ, that we might be justified by faith. 25 But after faith has come, we are no longer under a tutor.
The law was a temporary measure until Christ came, the law was the tutor (the household servant who took care of the children and made sure they got to their teacher). Once at the teacher there is no need for the tutor, because there is no going back, we stay with the teacher (Jesus).
Hebrews 8
But now He has obtained a more excellent ministry, inasmuch as He is also Mediator of a better covenant, which was established on better promises. 7 For if that first covenant had been faultless, then no place would have been sought for a second. 8 Because finding fault with them, He says: Behold, the days are coming, says the Lord, when I will make a new covenant with the house of Israel and with the house of Judah 9 not according to the covenant that I made with their fathers in the day when I took them by the hand to lead them out of the land of Egypt; because they did not continue in My covenant, and I disregarded them, says the Lord. 10 For this is the covenant that I will make with the house of Israel after those days, says the Lord: I will put My laws in their mind and write them on their hearts; and I will be their God, and they shall be My people. 11 None of them shall teach his neighbor, and none his brother, saying, Know the Lord, for all shall know Me, from the least of them to the greatest of them. 12 For I will be merciful to their unrighteousness, and their sins and their lawless deeds I will remember no more. 13 In that He says, A new covenant, He has made the first obsolete. Now what is becoming obsolete and growing old is ready to vanish away.
Not only is the first Covenant a curse, but it is obsolete and faulty. Now some might jump up and down and say "How can anything from God be faulty?". It was faulty in so far as it could not secure salvation for people, it was weak through the flesh (Romans 8:3).
Matthew 5:17-18
"Do not think that I came to destroy the Law or the Prophets. I did not come to destroy but to fulfill. 18 For assuredly, I say to you, till heaven and earth pass away, one jot or one tittle will by no means pass from the law till all is fulfilled."
The passage has been quoted many times in an attempt to show the continuity of the law until the end of the physical universe (heavens and earth). It does not however say that the law would continue until then. It is recognised by many that the phrase " till heaven and earth pass away" is a proverbial saying indicating the certainty of a statement, however, even given the literal sense of this phrase, we can understand what Jesus was saying. He was saying, to paraphrase, "until (unless) it is fulfilled it will be in force until the end of the age".
In regard to the law, Romans has these things to say:
4:14-15
For if those who are of the law are heirs, faith is made void and the promise made of no effect, 15 because the law brings about wrath; for where there is no law there is no transgression.
5:20
Moreover the law entered that the offense might abound. But where sin abounded, grace abounded much more,
Colossians 2:14
having wiped out the handwriting of requirements that was against us, which was contrary to us. And He has taken it out of the way, having nailed it to the cross. 15 Having disarmed principalities and powers, He made a public spectacle of them, triumphing over them in it.
16 So let no one judge you in food or in drink, or regarding a festival or a new moon or sabbaths, 17 which are a shadow of things to come, but the substance is of Christ.
The handwriting of requirements is the law, which was a shadow of what was to some in Christ. The idea of the Old Covenant (law) being a shadow is found most prominently in Hebrews:
Hebrews 10:1
For the law, having a shadow of the good things to come, and not the very image of the things, can never with these same sacrifices, which they offer continually year by year, make those who approach perfect.
It is quite clear that the law has passed away. It has passed away as a whole system. A covenant is not added to as some contend (see Galatians 3:15). The new Covenant replaces the old one, it does NOT add to it. Those seeking to retain the law, usually only want to keep parts of it. This is not possible. It's all or nothing, consider Galatians 5:3-4:
And I testify again to every man who becomes circumcised that he is a debtor to keep the whole law. 4 You have become estranged from Christ, you who attempt to be justified by law; you have fallen from grace.
Refrus