The estate that i got most of my double hoses from had a Nice 1970 Royal Aquamaster. I had spoken to the son of the fella that died when i bought up the gear.
This Royal had hoses which were ok, mouthpiece ok everything was great except for this huge hole punched cleanly through the centre.
It happens that the son when he was young and stupid thought that the neat round Royal Aquamaster insignia would make for a very nice 100 yard target.
He apparently took his dads rifle out to the reange and his new target and proceeded to put a round through it. He thought it was a junk reg because no parts were available so he ruined it. Apparently his dad gave him a licking the likes he says he has never had.
Anyway, it was such a well placed shot that not one mechanical part or yoke was serviceable. Only the hoses.
Youth is wasted on the young.
Then again age and threachery will always win out over youth and skill