Nut just retains the prop in case it becomes loose on the taper as far as I’m aware.You mean that your props are on a taper, quite normal. the threaded bit is what's not clear. To me at least
Is the thread some sort of adjustment on a stuffing gland or the cutlass bearing? Not really had any experience that low down
The stripper performed well in the YM or PBO test, can't remember how the spurs fared but this came up for £60 so I thought it was worth a punt.They are cast and not sure exactly the type of stainless but they have to keep a decent edge so I think 316 would be too soft.
A bit more to them than just welding bits to a hub, they have to be fairly well balanced, personally I prefer the Spurs type although the strippers have a better designed keeper. Then again if I am fitting the Spurs to a boat I make up a full circle bracket for the keeper.
Yes, they just clamp on and thus need to be machined to a fairly good fit. If they slip with a heavy piece of rope being caught then no big deal but the more likely scenario is that the fixed blade will snap off at its latches.AFAICT it just clamps to the shaft like a split coupling. I've never seen one in the flesh.