I've put this in Lil's 'cos EVERONE reads Lil's! If you are/were a RN diver or Diver's Yeoman of a certain vintage, you'll be familiar with the good old Conshelf 1st and second stage. In Guzz a couple of weeks ago I bought a couple of second stages with duff (split) exhaust diffusers. I have the RN manual and a very good online pdf manual. By exhaust diffuser, I mean the black rubber bit on the back where the bubbles come from!! Both manuals glibly state, in the style of a Haynes Manual, 'simply place in hot (200f) water and then carefully remove'. What they meant was, scald yourself stupid and then rip all arm muscles while dislocating both shoulders - and that is just the easy bit, getting them off! I eventually managed to get one back on, but had to use some tools and yes, split it putting it on. So, the question. Is there a secret? Or an easy way to get the exhaust diffuser back on or off?