springs and blocks

Hello all

I was reading thru some old threads on this site and found the following post

I have a solution for that one Adrian.  My local Marine store has sells stainless springs for less than two bucks each.  I fitted these on just about every block on the boat -- now the blocks stay in place when there is no load on the sheet.  No clatter, no banging, no deck damage.  Probably the cheapest and most successful modification I have made to the boat.

Has anyone installed springs on their rigging blocks? I like the idea but can not envision how this would work? How to extend the blocks to accommodate the springs?
I will have to take a closer look next time I am on the boat

Any thoughts?