"edge finder at those speeds" WHAT! No no, no. We are on a different page here, No, edge finder does not spin in this case. Please be careful, I don't understand and that's ok. I have been wrong before, lol.
stu
Other than that I use a solid edge finder (a probe) I consider accurate. Tramming or truing up a part, vise or work piece I suggest an indicOL.
Edit: indicOL, https://www.google.com/search?q=indi...Q&ved=0CDEQsAQ
I have several, so nice and easy to use.