Thumping noise from shaft

[keithw88]

I had a thumping sound and some vibration from a Maxprop after I relaunched my boat after a yard changed the cutless bearings along with an antifouling job. The issue turned out to be that one blade on the offending prop (I have two engines) was not set to the same pitch as the other two. (Maxprops need to be dismantled to remove them from their shafts, so the yard had made the error in re-assembling the props.) It was very worrying, but in fact a simple cause and solution - once I had paid for another lift-out and a call-out charge for an expert to come to advise...