I took my 24" x 24" x 1 3/4" Hawboldt Mega 4 bronze props in for a prop scan. The business owner had a low opinion of Hawboldts overall. Nibral material would be preferred for strength/weight but the Hawboldts add thickness to the bronze to prevent flexing. The initial report is that my 4 blade props were fairly well balanced going in, still the business is unimpressed with the manufacturer. Anybody with real life experience care to comment?