For my 10 inch f3 mirror i have been starting to use the Ed jones method of parabolising. It took him approximately 2.5 hours to parabolise an 8 inch f3. I am using the technique he shows in his videos, 5 inch tool, and half half edge to edge strokes, and half elliptical/oval strokes.
I have been working the long straight strokes more to more aggresively "hog" the center but it has hardly done anything over 30 mins of work. I have been working the ovals to cross the center at the closest, but not with the center, and at the furthest just kissing the left edge, so not a centered oval. Obviously this seems to be nowhere near as agressive as the method he is using, although i am trying to imitate it. Any input?