I appreciate this kind of feedback Rumpfy, thank you - please keep it coming.
I was in two minds to post pics of the bike knowing some of its failings, but happy to "risk it" knowing others would be pointed out that would assist me in getting it right eventually. The short RD housing is news to me, but now you mention it I see it and will fix it. The tyres and saddle will be swapped-out once I find suitable replacements, the brakes tuned when I get some time.
Staying: 1989 Pace RC100 _ 1989 Trimble Inverse 4 _ 1990 Bradbury Manitou _ 1990 Klein Attitude _ 1991 Bradbury Manitou _ 1992 Yeti Ultimate _ 1994 Merlin Ti _ 1995 Yeti ARC _ 1995 Specialized Epic Ultimate
Going: 1990 Fat Chance Yo Eddy! / 1991 Klein Adroit / 1996 Yeti ARC-AS / 1997 Klein Quantum Pro