Bought a FSC from a guy on here a wile ago. It was supposed to be 'nearly new' and 'working perfectly'. Collected it one dark night, got it home and its a pile of poop. Its leaking from both the top and bottom of this head assembly. There looks like there are grooves inside the head for some sort of o rings but they are worn away.
Supposedly it came from Exchange Engineering but when I spoke to them its so old they have no parts and aren't sure when they stocked it last.