Thanks for the replies! I did try to loosen the motor to remove it, but nuts behind the motor started spinning and my spanners (wrenches) were tricky to get in place. I actually removed the ram casing bolts and was able to crack it open by prying some tabs on the top of the plastic shroud. This allowed me to disconnect the drive cable. Basically at that point, the whole piece fell apart and with some twisting and so on I got the other side out as well thus removing the whole piece. I think the manual solution would work with the motor removed too, so thanks for that suggestion 987_986. I did take the mechanism apart to see if there was an obvious fix, but nothing stood out and I have a used one on the way for a decent price., Thanks for the suggestions and I will post an update if I get it all back together. One caution when removing the assembly is that it is easy to bend and in re-assembling it I think probably did bend the mounts that the ram housing attach to. Also, I slightly broke the ram housing, but not terminally. 23 year old automotive plastic, not a surprise.
Cheers,
Paul.