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I've got one that I bought at the names show from little machine shop. Then proceeded to not use it till I needed to indicate a hole at work. I use it fairly often now that I've gotten over the idea of turning the spindle on with an indicator in it. Mine has no means of changing from ID to OD but does have 6 tips, 3 bent and 3 straight. You do need a lot of room even with the short one.Art
Yes I turn the spindle by hand to get it a semblance of centered. Then turn on the spindle and just move the dials on X&Y till the needle stops moving and its centered.