We do this at our yard for every new prop, or if we feel it should be done. We always do it with shaft in the boat.
1. Remove spurs (optional, I find it easier). Key should be removed. Clean shaft and inside of prop hub completely. Tape around cutlass or wrap a rag around it.
2. Lock shaft so it will not turn. Apply generous amount of heavy grit lapping compound. Rotate prop back and forth 1/4 to 1/3 turn, Rotate prop around shaft as you do this.
3. Repeat steps with finer grits until the prop gets harder to rotate and almost feels like it is catching.
4. Thoroughly clean shaft and prop hub and apply pursiun blue (I know I messed up that spelling I am to lazy and it is to cold to run to the shop and look at it). Put prop back on shaft with out bumping the shaft around inside the hub. Remove prop and check contact pattern. Repeat lapping process if necessary.
5. Clean inside of prop hub and shaft again. Slide prop back on shaft untill it is all the way on (still no key) and mark around the shaft at the back of the hub with a sharpie.
6. Remove prop install key. Prop should slid all the way back to the mark. If it doesn't it is key bound and you need to clean the key, shaft, prop hub, and check for burs.
7. If not key bound put on big nut and tighten to press prop onto shaft. Remove big nut, then install little nut, tighten, big nut, tighten, and last the cotter pin.
If you arms feel like noodles you did it right.
That was cool, here I am looking for some sort of boat porn, lapping a prop, really?? ,,, and I just spent the last 1:45 minutes looking at a bunch of cool Keith Fenner youtube videos. This site is great.
IN you make the trip to N/C maybe stop & the Betty Ford Clinic for a quick hello....Actually I've been torturing CaptLarry for a while now. Information and what to look for is amazing and hopefully I'll be able to put it to practical use shortly. Used to be when someone said shaft size I went to the mermaid section.