I recently bought a second hand bike which was originally sold with a flip flop hub to fix up as a project. The person I bought it from gave me a rear wheel with a geared hub.
However, when I put the wheel onto the frame, the remaining axle that sticks out is quite small; when I put a locking nut on it, the axle doesn't go all the way through the locking nut. There are maybe one or two threads left. I can use a wrench to tighten it very tight, and it does seem to be quite strong; however I am no expert.
Essentially: Is this safe or am I in danger of the wheel falling off? Should I swap the wheel out?
Sidenote: I have never dealt with geared hubs before. Do they always make a sound when rotating? Because that could get annoying for me.