<I assume that's the official procedure, which, needless to say, I am not <going to follow :-). Your committed, or maybe should be. ;) seriously, two most common problems is motors (communtator/brush wear and bearing out of round) and in ability to get the top and bottom disks to calibrate on track. Also the mech was really sloppy so for 96tpi positioning it was par with SA400 for "hitting the spot". <It looks as though if you make up a set of extender leads (for the R/W <PCB, Spindle Motor PCB and the upper clamp arm) you can run this thing <with the seek/interface board 'hinged' down. In which case alignment is <not too hard. And at least all the connectors are 0.1" pitch. That would be the approach. Do a funnel seek (0, 79,1,78,2,77...) and check for positioner hystersis. it was pretty bad one some. Unstable or motor speed that varied with +12 indicated the motor is going or gone. Last problem, drive is actually ok, choked to binding with dust or other nasties. Allison