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Hi Gary
Start by working away the `shoulder' area ( the edge of the hole ) on the edge of the tool, chordal stroke style. Once the curve is looking much more spherical , alternate MOT ( mirror on top) and TOT with say a 1/4 length W stroke until sphericity is obtained. If you want shorter FL spend a bit more time MOT . You can observe the behaviour of trapped air between the blanks to get a handle on their sphericity. Hope this helps.
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