Thanks Dave and Louie.
I'll work on it Dave
been along time between drinks.
Full refurbishment means sending scope to Japan to have the primary mirror reground and coated and the installation of a new focuser tube and pinion shaft. Collimation has been a bit tricky but I think i'm getting there. I know about the square stars issue but please enlighten me about any others. I may install some thinned vanes at a future day but atm I'm not too worried about the blocky stars.