Jack Edmondson wrote:A simpler way would be to just use washers on either side of the wheel. Match a bolt and nut for diameter and thread pitch and length. Epoxy and press the nut into the handle. press the nut into the pre-drilled hole. Add a washer to the bolt and put into wheel. Add second washer on other side of wheel. Hold the head of the bolt with a wrench and slowly turn the hande onto the bolt hand tight. the washers (if not over tightened) should allow the handle and bolt to turn freely as the wheel rotates at speeds under hand operation without a bushing or bearing in the wheel.
Here is a sort of illustration of Jack's second suggestion. If I were doing it, I'd find a good quality shouldered bolt - one with a plain shaft with a small clearance to the hole in the wheel, and threaded at the end as it comes out of the wheel. A flat washer either side of the wheel will spread the loads there.
The handle actually only needs to rotate relative to the wheel, whether the bolt rotates relative to the handle doesn't matter, since your hand will hold it the same way throughout the wheel rotation. It would be simplest to glue the end of the bolt into the handle firmly therefore, but if you had a threaded bush inset in the handle then it could be screwed in, and might be more durable (and disassemblable for storage). The ferrule helps spread the load into the handle by clamping the wood firmly and stopping it splitting so is worthwhile having for durability.