Ever tried to get the bellows perfectly compressed to specification on a PYI dripless shaft seal, or similar, while at full-arm stretch in the bilge, and then get the little set-screws tight before the stainless steel rotor slips back?
Sucks, right? But if we don’t get this adjustment right think sunk boat.
Very simple, very clever, and easy for a machine shop to make.
And, after getting the bellows adjusted right, we could even take the jacking screws out and leave the tool clamped down against the rotor for added security against slippage.