A cruder mechanical idea than some.
Works OK but may not scale up well :-).

ACW =3D anticlockwise.
CW =3D clockwise

Take a strip of fine emery cloth.
Hold target (here xtal) in soft jawed clamp , pins up (usually)..
Wrap cloth around pin in about 180 degree arc with eg ACW outer strip of
cloth just touching the other pin.
Draw cloth loop past pin while rotating whole cloth strip clockwise.
Whole loop should describe most of a clockwise turn as one length of clothe
is drawn past pin.

The above has the result of emery cloth touching pin over most of an 180
degree arc at any time and as the whole strip is rotated the whole pin
surface is covered,
eg if the original emery strip is at 0 degree reference angle and if it
ends up at say 270 degree then the pin surface is touched over 180+270 =3D =
90
degrees more than a whole circle in a single pass.

In practice wrap is under 180 degress and strip rotation in one pull is
under 270 degree BUT you c an cover about one full pin surface in a simgle
pull - with practice.
Repeat for other pin.

Coarseness of emery and pressure applied affects results.


        Russell


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