I was trying to replace the tiny brass connecting rod shims
that were all messed up on my Neptune, and in between
trying to punch a hole and cut out the .004 shim stock,
I ended up with a wrinkled mess, and could not keep the shims
in place while trying to install them. So, I went searching
for something better. My old feeler gauge is now missing
it’s .004 gauge. Made great little shims though 🙂
It’s tempered, was able to drill a bolt hole and cut
it with no wrinkles, and it stayed in place installing
the rod cap!
You wrinkles were caused by too much space between the upper and lower parts of your punch….. also the thinner the material the closer in diameter the punch,( upper ) and die ( lower ) must be. Tooling die clearance is 7-10% of material thickness, so material of .004 thich get less than .0005 clearance. How bout that, LOL