Hi y'all, We have had Spurs rope cutters on Pen Azen ( SM 302) for ten years. On a couple of occasions we have encountered fairly thick rope and the fixed blade has just snapped off. Spurs replacements are expensive and I am now going to try a different solution, a single circular blade made of two semi circles which bolt together. Whilst they may not cut as well as the Spurs cutter I expect them to be more robust, and they are much cheaper. We are away from the boat---question: Can anyone tell me the diameter of the prop shaft on an SM? Happy Xmas, Ian and Judy, Pen Azen, SM 302 Snow bound in London