Ryan O.
Out of Foam Board!
Thanks. When I first got the engine I didn't understand why there were two until yesterday. One is made to fit into the other because one has some metal extending from it and the other has a cavity for the metal to go into.Bad choice of words should of used bolt does the bolt get into the nylon part of the nut so it locks the mounting bolts from vibrating loose? Don`t just tighten the prop nut double nut it and lock them together you will thank me later if it ever throws a prop with just the one prop nut on no matter how tight you tighten it..