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You don’t specify the physical size of the graduations, could they be in inches, cubits, rods, poles, perches, fathoms or even the evil millimetre? Whatever they are I’d say that the tool, effectively a depth gauge, would be very useful particularly given the axial orientation of the plug threads.

The only down side is that you will have to do a bit of trig as the position of the piston in the bore at ignition is dependent on connecting rod length, engine stroke and chosen ignition advance. For all practical purposes it is then just a matter of noting the point on the gauge at tdc and then setting the ignition points with the piston down the bore by the calculated figure.

The up-side is the removing at a stroke the need for mole like peering at an oily flywheel inconveniently and darkly buried somewhere in the middle of the brute.