I had an unfortuate occurrence with a shaft saver last Fall. The unit had been "professionally" installed when a Max Propwas istalled as more shaftlength was needed about 5 yrs earlier. The unit has nuts with nylon locks. Apparently the nuts slowly backed out and, when putting the engine
700 miles from anywhere, the bolts sheared off, dropping the shaft, mis-alligning the LasDrop, and starting to flood the boat. Luckily I had a shaft collar on the shaft which kept it from backing out and jambing the rudder
. I supported the shaft, realligning it, and the leak stopped. Had to sail the rest of the way, no problem as the wind
was good. I've added torqueing those nuts to my pre-cruise list.