How to make a universal key

Good day to all. Today in this article we will consider one more variant of a universal key. The author collected this key from improvised materials and spent time on its assembly completely silent.

For this device, the author needed the following materials: a bolt, three nuts for it and a piece from a bicycle chain.

The author put two nuts on the bolt.

Then he measured the desired chain size.

Further, the author disconnected the circuit in the marked place. To do this, he clamped the chain in tees and with the help of angle grinder he sewed rivets on the chain first on one side.

Then, on the other hand, did the same.


Then he welded one end of the chain to the nuts dressed on a bolt.

Then he aligned the chain with a bolt and welded the second edge of the chain.

And at the end of this homemade The author processed the welds of angle grinders for a better look.

That's all the author’s universal key is ready. The key works like this, unscrewing the bolt chain gives slack, and twisting it back the chain of course stretches.

Unscrewing the bolt and inserting the nut between the bolt and the loose chain, the bolt should be tightened and the whole nut can be screwed on. Which the author demonstrates in the photo below.

Homemade video: