New daiphragm arrived today : fitted ( did not strip the rest of the block) :left door open about 7 mins and mighty cheer as suspension went up !!
Thanks a million again.
A couple of spin offs
i) the new diaphragm was completely different from the one which came out so much so that I phoned Simon at Symtec (?) who said that what I described as the old one sounded like a Dutch after market job ( it had no metal plate in the centre and was really tight in the seat.) (ii) I managed to strip the threads on the exhaust filter ! Got it stuck in off the threads and exhaust puff blew it out !
New filter on order : any probs running without it other than dangers of crud.?
Just a cautionary tale for members : I had spent yonks on trying to race what I assumed must be a leak at the bags after I had replaced rear bags. Problem was down to the diaphragm all the time . Frankly hardest pasrt of the job ( for me) was getting the leccy plugs separated !