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I recently made 4 copper plates for my 4" CD and all told it's easier and cheaper to buy them from SD. I only had a few days to play with the new ProCaps and could not wait.
I purchased a piece of half hard c110 copper of 0.060"/1.5mm thick. I covered it with painters tape and drew the plate design.
I then predrilled all the holes while it was still in one piece and finished cutting each plate on the bandsaw.
Finished by hand with a file and sandpaper.
Removed the tape and finished sanding.
Ready to go.
I am sure the next batch will be coming from SD. It was a fun project but I tend to be lazy.