Right...cough... remember when you were a young engineer you always had to know how things worked. I remember taking a clock apart, and my electric train, my mums iron. Then I got into motorcycles and that was great fun. been doing it for 45 years with varying degrees of success. Always have to find out how they work and maybe put them back together. Well.. oh dear I am not sure how to say this....I was very interested in exactly how the ball screw worked. You guessed it. I unscrewed it and the balls fell out. After spending the last hour trying to rebuild it I realised that the plastic bungs are where they put the balls in and then press hot plastic in to close it off. Is this now an ex ballscrew system or is it fixable? Thankfully it was the shorter one if it has to be replaced.
On that high note of failure goodnight

Bruce (yes i am going to spend the night standing in the corner)