You won't be able to lift the hammer that is capable of knocking off a triple frame, Ron. The footrest mounts are perhaps the strongest parts on Laverda frames. If you ever try removing one, you might understand...
I use this, admittedly brutal, method often, both on twins and triples. Not once has anything broken or bent, except the footrest in question. It doesn't even damage the rubber! Haven't had any chrome flake off either.
Don't "tap" it, hit it like you mean it! And beware the reciprocating hammer.
piet