Thanks for the valueable advise, Scooter. I'm not going to attempt this myself or involve anyone else with me. It will be undertaken at a nearby garage and I can therefore inform the mechanics of what is required to from through experiences of this forum.
When you say it requires to be rotated, will this be fwds/back or right/left/ sideways rotatation? I guess a good spray of release agent (wd40 or similar) would help with the release of the coupled drives and obviously an application of loctite for the bolt threads when it is finally coupled? Thanks.
Phil.