Hi Jeff:

I wouldn't want to try to duplicate this shape by hand. The thickness
at the edge is about the same as a regular washer. One side is
conical, making it about double in thickness at the inner diameter.
The reverse side has a counterbore.

Regards,
John.

Jeff Wisnia wrote:

You can buy a postcard sized sheet of red rubber gasket material for
under a buck in the plumbing section of most hardware stores or Home Cheepo.

It doesn't take rocket surgery to carve out a washer like that with an
X-Acto or utility knife. Stack up two if one isn't thick enough.

HTH,

Jeff

--
Jeffry Wisnia
(W1BSV + Brass Rat '57 EE)
The speed of light is 1.8*10^12 furlongs per fortnight.