Over a whole bunch of years at a photo school that taught b/w darkroom I changed gears (almost always on the crank handle side) in the B23Cs a number of times (we had five of them on the go). THE TRICK is that pin punch. With that, the spare parts, and of course the appropriately sized hammer, the job can be done is a fairly short time.
I have to say what a workhorse the Beseler 23 series is. The fact they stood up to all those students for all those years is a testament to their simple, robust construction. (at least a couple of them withstood almost 35 years use).