How to Springs

Not much to go on with that, but it could be made from high carbon steel or beryllium copper. I can't help but think that guys that can do the math would want to know more so they could steer you the right direction.

Harold

This might be an interesting read for you:

One method is to obtain the large main spring from an old clock and cut the size you need.

Jack

Jack,

I have given thought to cutting it from something, the clock mainsprings are a little thin for what I need. The spring from an old steel trap would be perfect, but I understand they no longer make those.

Roger

Find an old chain-saw pull-start (or weed eater, what have you) and grab the rewind spring.Or find an old wind-up alarm clock.

OH OH!! I missed that 80 thou thickness bit. Makes it a bit more difficult. Sounds like a spring for a sliding padio door trolley or something - I know I've seen just what you are describing in some door or window hardware a year or so back (when I spent some time helping out a customer in their window and door business)

Go to

Perfect!!!

If you don't want to order the whole assortment, check with your local locksmith. We would get these assortments and usually have a lot of the wider sizes left over.