On another point , I have been wondering if the rib around the back edge of the cast Pyrex piece makes difference. The larger pieces I have a flat , but this Pyrex piece is cast in a tapered mould with a bottom with a ridge like a cup or bowl would.
Quote:
Originally Posted by Rod
Meant to write short straight strokes mirror on top earlier. I’ve corrected my earlier post. TOT will probably work too but these days I’m finding MOT works best for me, probably because I use slightly oversized laps - usually about 6 mm larger.
Rod
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