ATM figuring question

["Aditya Munshi" <amul49@eth.net>]

Hi everyone

I am figuring my 8" f/7 mirror which had a severe TUE (ROC diff 10 mm)
and a central hole. When I attempted TUE correction with a TOT Chordal
Stroke it created a severe surface irregularity ( I could see 6 small
depressions arranged in a circle around the centre in the Foucault
test). However I have come a long way since then, hot pressing and
polishing out defects with only slight variations in stroke length. The
Central hole is nearly gone and the TUE ROC diff is about 2 mm. The
problem is that the surface irregularity has also disappeared with about
4 hours of MOT and TOT work. The surface is pretty smooth as a whole but
I can just spot the 6 depressions in the Foucault test. As a next step I
will probably try micro-faceting and slow gentle polishing but any help
is greatly appreciated.

The irregularity is very minor as compared to the previous figure but
still I think it would be best to iron out all visible defects.

Thanks for any help

Aditya Munshi