Only pretty regularly. If they are mounted like in a Model 19, this damps the bells somewhat, but not enough. Plus, when you move back into the horn where it really counts, they ring like crazy until you get back near the throat even when clamped like in the consumer models, so it's worse with the A7's metal brackets. If mounted only on one flange, then obviously it's much worse. To ~effectively damp these requires several pounds of oil based clay, or better still, build a box for them and fill it with either sterilized sand or Portland cement, filling the bells also. Or if you're lazy, just toss a bag of kitty litter on top of them.

This still doesn't address the stress issues due to welding that can only be resolved by cutting out the vane welds and interior vertical brace, filling the vane's voids with a lossy material and adding exterior stiffeners (if you don't do the filled box tweak).

GM