I always wanted one of these, I remember they used to be sold in SA through magazines as a All round versatile vacuum. They back in 1985 cost R 179.00 or $ 17.90 I loved them and have been after one for a long time
I always screw the part needing work to the workbench as this stops it spinning around when I start removing paint, I use the larger grinders as they spin slower than the smaller ones so you can't distort the metal.
When replacing vacuum bearings like these its important to get the right type, The 3c is really important. It means they have extra clearance in them for high speed and heat generated by the high speed.