Whoops! Another measurement I forgot to make… the motor pulley I ordered is too wide for the motor shaft on my SK3. After the motor is installed on the motor mount, I’ve only got 20mm of shaft available for use. The screws of the motor pulley don’t come into contact with the shaft at all.
So, I either order a different motor pulley, or attempt to mount it using just two M4 grub screws. Will that work? I would, of course, create two flat spots on the shaft using my dremel tool.
BTW check out @torqueboards black anodized motor mount; a nice piece of bling! (shown in pic)