On Thursday, November 16, 2017 at 10:50:08 AM UTC-8, Bob La Londe wrote:
I've decided I need to make some electrical tool height setters for my
machines with a fairly small foot print.
... I was thinking stainless might be the ticket. 304 for the body,
and 303 or 416L for the anvil with an acetal insulator. A harder
machineable insulator might be better, but I am not sure what.

Glass is dimensionally stable; the dense fiberglass/epoxy plastics would
be good, as well. Available in sheet or tube forms.