Hello, im interested in a listing for a sunnen 2-6" dial bore gauge, the reason im looking at this one is for the fact you can retract the fingers to move it around a cylinder easier, I do alot of 2 stroke cylinders and it would be nice to measure them while still clamped down in my honing tank. With my current dial bore I have to unclamp the cylinder to measure the opposite end because otherwise the gauge just gets caught up in the ports trying to move it around in the cylinder. My question is can the sunnen be zeroed out using a outside micrometer? I see sunnen has a setting fixture for the gauge which is costly so im hoping i can possibly avoid that. Thanks