Removing the tank on 180s with a seat hinge is a piece of piss. On an earlier one, it means that you have 1 or 2 13mm spanners on hand.removing the tank on 180's is a piece of piss, that centre plug thread is vulnerable to getting cross threaded and I wouldnt remove the plug (at home), without giving the pocket a strong blast of compressed air anyway, I use a 3/8th very long extension and a plug socket with a rubber insert, the very long extension gives you a good line on getting the plug straight, and as iis says, (strong pint here John) get it well and truly started by hand before using mechanical leverage to tighten it, I use a sliding tommy bar.
CLEM
Paul