Ok, no more waffling now without pictures, but something to add from yesterday (I did not mention in case it didn't happen).
The Z axis gas strut needed replacing and was not available off the shelf. I contacted SGS Derby just after 5pm yesterday
(Friday) not really expecting a reply. Surprise surprise, phone was answered and the manager said he would get the strut made
(I was able to to a full spec.) straight away and I could collect Sat. am. Another bonus, that purpose made strut was about £20.00 cheaper than the out of stock standard item. I collected the strut this morning and hope to install it on Monday. Who says you can't get good service from UK firms. Well done SGS and thankyou. G.