RE: Welcome to Club SAITO !
Hobbsy, thanks for the info! I have a Saito 91 that turned out to be not such a good deal. I was going to clean it up before I used it and came across discrepancies. One of them being a stripped out screw on the lower left rear cover plate. I believe those are 3mm screws. The cylinder hold down screws are slightly larger at 3.5mm so I thought I would re-tap the stripped out screw for a 3.5mm one. Initially, I wanted to modify a 3.5mm screw into a tap using a cutting wheel but a purpose made tap would be better. I would hate to mess up a crankcase with something not up to the job. I just wanted to be sure which tap I need to order.
Joe