John Doe fired this volley in news:4f67b801$0$860
:

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?


Belville washers. You can stack them to any height you wish, and get them
in anything from mere foil to structural thicknesses.

LLoyd