I have simply fixed it by putting in a couple of small bits of paper between the focuser tubing and the outer cover. No wobble now
![Big Grin](/vbiis/images/smilies/happy04.gif)
BUT there are several broken teeth in the pinion
![sad](/vbiis/images/smilies/sad.gif)
. It still works but the tube can slip if the teeth aren't engaged. At least it's only a webcam that will be attached. I will need to check if there's any slippage when it's connected.