Hi Jeff Thanks for the explanation, it hadn't occurred to me that this type of edge finder is used stationary. I guess the thing to do is try it in four positions, which would soon show up any run-out in the chuck. Anyway you've got me interested now, and I'll see what's available on this side of the pond. Cheers Ron ----- Original Message ----- From: "Jeff Dayman" <jeffdayman@xxxxxxxxxxxx> To: <modeleng@xxxxxxxxxxxxx> Sent: Sunday, February 26, 2006 2:56 Subject: [modeleng] Re: Wobblers > ....If you used the electronic edge finder rotating, it would flicker as > you > suggest. I would also be concerned about wear, because the tip and shank > are > made fixed to each other and are not designed to turn..... 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.