Before calculating the steel is 10 inch 3/8ths inch wall. So larger, thicker,
and much much heavier.

Scott Hogsten

In article , says...

qedude wrote:

If I can't solve the problem simply in the next couple of weeks I'll
probably
just replace everything with steel.

Probably won't help. Steel has three times the elastic modulus so will
raise the frequency. Steel has three times the mass so that will lower
the frequency. Haven't calculated it but the net result may well be
little or no change.

Ted