They are not bolts, but pressed in studs. They only go into the back of the propellers about half way. We remove them because they can cause the prop to split. Many, many hours running G-62s without the studs.
http://www.horizonhobby.com/z445-gt80-pin-zen0402500312
Last edited by Steve Percifield; 05-31-2015 at 05:29 AM.