[Ron Wood]

John,
Under magnification the lug appears integral to the housing, all machined from one piece of solid stock. I see no reason why a replacement couldn't be easily fabricated. The trick is attaching it to the housing. Silver braze would probably be strong enough to allow attachment of the stock. I am not sure it would hold up to firing (not much chance of that anyway). It could be strengthened by pins integral to the lug placed in corresponding holes drilled in the housing and, in addition to the silver solder, peening the pins over on the inside.