I'm going to try one of the composite, variable pitch replaceable blade props on my 135 Optimax for awhile this year as I get used to the lake. They are 4 blade and should you break a blade just take that one and the opposite one off and come in on a two blade prop with no vibration. About $200 with replacement blades $30. I haven't nicked a blade yet in 55 years but then I haven't boated much on Winnie.
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