[GAH, re-send because 'reply' seems to go to the individual poster now instead of back to the list... ugh :/ Sorry Pete, you're getting two copies ] Yeah, I'd thought about doing that, too - but then I wondered if pulling the Z axis negative triggered the erase; that would seem like a neat way of doing it. I suppose that might be functionality I could add myself, too, and would avoid having to modify the external panels in any way - however space inside the case is extremely limited. We need a bitsavers equivalent for test equipment! :-) cheers Jules