Thought I'd post this project up in case it's of any use to others, from conversations I've had with other Tormek owners I'm not alone in having a problem with being unable to get a square edge on anything I grind on it.
I've had the Supergrind for 12+ years & other than the problem I mentioned I was happy with how it works. At first I thought the out of square blades were down to user error until a few years ago I clocked the drive shaft to the jig support bar & found they weren't parallel.
So for quite a few years the machine has been gathering dust that is until last week when I had reason to move it & thought if I can't fix the problem I may as well sling it, so I started by completely stripping the machine
The first problem I encountered was I couldn't get the stone off the shaft, water had corroded the chromed steel shaft& it was stuck fast. I soak the nut in penetrating oil but to no avail 2 days later the shaft wouldn't budge so I decided a bit of googling was in order.
It turns out seized shafts were a common problem only one way forward as the stone is more expensive than the shaft & I couldn't see the point of only half doing a job & rebuilding it with a seized shaft/stone.
After much drilling & machining the stone was finally free & happily in one piece. I've managed to source a new shaft which not only is stainless steel to address the corrosion problem, it also has a quick release locking nut & best of all comes with 2 new bearings which I had thought I'd have to make.
The new shaft should be with me in time for next weekend when hopefully I'll have chance to sort out the alignment problem & start to put the grinder back together.