[Garyh]

Originally Posted by Satchmo

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.

Thanks Mark for that info....
using the pipe fitting does hog the middle out well but leaves the edges very flat...shall start with that chordal stroke...
cheers Gary