When you motor at night, you may pick up a line of a lobster pod. It can cause a lot of damage to the sail drives. I have installed the Stripper from Ambassador marine. It is not difficult to install in combination with the Volvo folding props. It does require a modification to the propeller hub. Two small shallow holes need to be drilled and a ridge has to be removed. Also it required modified sail drive anodes. Ambassador marine can provide these or you can modify the existing anodes. The recess in the anode needs to be increased to 14mm x 87 mm. And a 14mm hole must be drilled in the lip.