Many years ago a friend who was instructing on using a lathe said a stuffing box is a good item to make.
With the screw adjustment that brought pressure onto a few winds of string and vaseline, it clamps tightly onto the rotating shaft but only for 0.5mm leaving the shaft hardly feeling the drag. Works well but not an item that would sell commercially.
The commercial shafts and their bearings in the tube are not interchangeable. There is too much variation in the actual diameter of a 4mm shaft, or 5mm come to that.
I recently upgraded an open frame red magnet electric motor as the shaft was sitting in a 20 gauge aluminium frame. I just used the interlocking brass tubing you can buy, which with a 5mm length and lightly oiled can make a good bearing surface.
I accept phosphor bronze is much better but I can so easily replace the existing bushes it does not much matter.
In commercial prop shafts it is easy to knock out the end bearings, Just pull the shaft out a bit to the other side of the bearing and hit the shaft end lightly with a hammer and they fall out.
This way you can shorten the prop tube and then replace the bearing.
The biggest problem is when you come to threading the shaft, I have to visit my friend with a workshop and he does it using his lathe.
There is an additional problem as the thread cutter has a grub screw to adjust the cut and you want as tight a fit onto the prop or U/J as you can get.
Lew sorry to go off piste a bit with bearings!
Roy
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