Maybe I should tell you guys about the propeller that was filled with grout at the company I used to work for...Hartzell variable pitch prop (I think hartzell anyway...),client was coming in to inspect the "new" propeller that hadn`t really arrived yet so we were instructed the night before to fill in the old propeller with grout!!,and spray it over and clean it,and the pilot wanted to fly the damn thing!!!,had to pretend the brakes were faulty because the prop wasn`t tightened up alot!!..the prop arrived next day thankfully but..geesh!!