In article ,
John Doe wrote:

I want to put a spring under the heel of my inline skate. But
there is only a 1/2 inch clearance, and it needs to be a
heavy-duty spring. Should I consider using a spring steel flat bar
or similar, instead?

Thanks.

Look into Belleville disc springs (aka washer springs)

McMaster (among many other places) sells them, and has a brief
introduction to them if this link is any good (or go search their site
if it's bad - sometimes they don't like to paste right)

http://www.mcmaster.com/#belleville-...prings/=gqic79

McMaster is often fast, often has stuff, but is not always cheapest if
you are trying to squeeze the last penny out. They are not infrequently
cheap enough if you hunting for the absolute best deal involves spending
time that's worth anything on the search.

For instance 9712K69 - Qty. 12 3/8 ID 3/4 OD 166 lb working load each
with a height of 0.055 inches for $4.12 - you can fit 9 in 1/2" as an
inverted stack, giving a deflection at working load of 0.099 inches for
the stack. I'm assuming you have 3/4 inch width available, and are
trying to fit 1/2" height. Other options are available if that's not the
case.

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