I replaced the wank old troll abseil bolt with a chunky glue-in last autumn. Andy - if take a 70 or 80m (can't remember) ab rope you can just ab to the base of the cliff, clipping it in ot the top of the route as you pass. This has the added beenfit of allowing you to ab back in from the top of the pitch to do another route(s), pulling out after the last route.