Well, I finally got a Hi-five prop (went with a 25 pitch after much consideration) for fishing and pulling tubes, but I have never had to deal with vent holes before. Running a PIV with a Rude 200 ho. Want to prepare myself in case I have to mess with the “holes”. Came with what appears to be the large vent holes in all five. Best guess if I most likely will have to plug some of them. I hope not because I do not want to mess with the suckers, but I want to be prepared. Thanks for the help.-Joe.