Originally Posted by Duuuuuuuuuude
I know this is an old thread, but can you use knobs with a set screw on a split shaft?
If the diameters match and You position the set screw onto the slot, yes you can.
Or, if there's a pointer You want to point at a specific direction, fill the slot with a strip of something hard enough not to compress when tightening the set screw.
More likely than not though, the knob won't rotate without a wobble no matter what You do.
It's up to You/Your customer whether that bothers someone or not