"Robin S." wrote in message
. ..

snip---
I would try to drill the holes before parting as you tried originally.
Being
so thin, you're asking for deformation due to clamping and drilling.

Just my $0.02 worth.

Regards,

Robin


Chuckle! Having spent the vast majority of my years in the shop doing small
work, I would be at a loss to understand how it would get distorted. I
could clamp and drill a .010" thick dead soft copper disc without harming
it in the least. When you do small work, you work and think differently.

Harold