Hi all Thanks for your replies on the angled attachment in the wobbler set. I did wonder if it is for attaching a DTI, but I've never found a way of fixing any of mine to it. I don't think it would be very rigid even if I did manage it, so I agree with John on that score. I find it much easier to chuck a piece of 1/4" steel, fix a cross-arm to this using one of the clamps from my magnetic base, and attach the DTI to this. Jeff, the electronic edge finder sounds interesting, but how is it affected by run-out in the chuck? Does this cause the light to flick on and off as it touches momentarily on each revolution? Regards Ron 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.