Hi Terry Thanks for your helpful message, suggesting boring the headstock right through, and inserting a bush, to contain the bearings. This would be by far the easiest method, but sadly, my design includes pulleys in the centre of the headstock, which would divide the long bush into two pieces. Cheers! Hubert MODEL ENGINEERING DISCUSSION LIST. To UNSUBSCRIBE from this list, send a blank email to, modeleng-request@xxxxxxxxxxxxx with the word "unsubscribe" in the subject line.