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I've got some slight cracking in my aluminum nosebowl and have stop
drilled them twice.
I'm considering backing the cracks with fiberglass in hopes to keep the
vibration down.

How about welding it? Just a suggestion (since I haven't seen the part or
the cracks). I didn't see that suggested and I can't help but wonder 'why
not'.

Just glass-bead blast that area and have it TIG'd up. I've seen some folks
successfully 'Heli Arc' some very delicate material. A character by the name
of Vince Wyatt used to weld little stick figures (about 2" tall) onto the
top of his Copenhagen cans at Todd Shipyard in the early 70's. I'd keep an
eye on how much bead (mass) is added to one side. Possibly add to the other
side to balance.

Does that sound feasible?