In reply to Lunaeventer:
Bolted crags in the Uk are pretty much an open resource and as such its up to all users to carry out maintenance as required.
However... and I will stress the next bit, and that is to carry out maintenance "within their level of experience and capability".
I would expect the vast majority of users are safely capable of general tidying of the crag base, removing rubbish and cutting down over enthusiastic vegetation.
A smaller group should have the necessary skill to safely abseil to remove gorse etc encroaching on lower offs etc.
Finally a small handful are experienced and capable of safely dealing with insitu equipment replacement issues.
Please dont be afraid to get stuck in within your own level of capability.
On the issues raised....
"Loose bolts"are very uncommon. Loose hangers however are common.
The former require experienced equippers to tackle, the latter can be tackled by anyone with the suitable sized spanner.
17mm and 19mm spanners will tighten all the nuts at Kirrie Hill.
The issue of seized and defective lower offs will require either some money to be injected into a bolt fund or a donation of new kit from somewhere.
I would not advocate using any of the small lower off "quick links" presently in situ at Kirrie Hill.