We have a small assembly that we have been working on and There is a roller that has to be changed every now and again for different ones. I was trying to think of a way to go about this and landed on the idea of threading the hub and threading the axel so the hub would be screwed onto the axle flush up against a shoulder in the shaft then a split threaded shaft collar would be screwed on and tightened up to fix it all in place. The axle is steel; the hub is aluminium and the collar steel. The hub, axle and collar are all M14 thread. It seems like a god idea to me but I can’t find any examples of this anywhere so I’m beginning to think that there must be something wrong with it. The only problem I can think of is that the whole lot would work undone but those shaft collars tighten down pretty solidly, that’s an M5 bolt in it. Any advise on why this is a bad idea would be appreciated and any alternative ideas welcome. P.S. I forgot to mention a pretty vital fact, I guess thought it was apparent from the drawing and description but maybe I'd better clarify that the rollers/gears are fixed to the shaft, the shaft sits in bearings.