Final update, one repair man gave up, thankfully the second repair man was more up on these machines and after a few hours found out the issue. The part where the shuttle sits needed bending a bit to make the fit tighter and took some of the excessive 'play' out of the shuttle. A couple of other minor alterations and she works perfectly. In the end it needed a knowledgeable person to eliminate things until he found the problem. I would still be in the same situation now if I had tried to fix myself. Just wanted to thank you all for your help and advice, appreciate your time and expertise.