Thankyou for your words.
The front corrector was my biggest "*******" so to speak i wasn't looking forward to tracking a star and fiddling with the corrector plate in the dark. i will use this method to get the front plate right.
the laser pointer in the method i have has only one job to do, and that is to project a shadow of the secondary mirror spot. There is no tomfoolery
and is extremely accurate as your not relying on your eye your looking at a target with a spot that moves when you adjust the primary, hence making the adjustment is quantitative. i found that after 3 iterations the spot didn't deviate from the target as compared with the rectical.
Apart from the front corrector being skewed i belive that i had 13 diffraction rings, though 12 confirmed diffraction rings that ran all the way around at even distance untill the bow caused by the correction plate when i star tested on monday evening (thankyou sky gods for steady skies).
Ahh the good old tube currents. as a owner of a reasonable size newt, these don't affect me though i was sitting there in aww looking at the laser swirling around in the Mak, funky
after about 30 min it settled down to acceptable levels.!