Quote Originally Posted by mitchejc View Post
Has anybody tried to fill the steel sections of the gantry etc with high density polyurethane foam and would that make any difference with resonance? I'm referring to the two part stuff that can be pored thru relatively small holes and then it foams into a plastic like solid to fill the entire void.
No it doesn't work very well there's not enough density. The best success i've had is with kiln dried sand. Very cheap and simple with good results.