Point of clarification from the "hang it vertically" proponents: I understand the benefit that oldstarfire gets from horizontal orientation. Most of the guys who hang it have the modification proposed by the late Oscar Gaddy--a music wire spring added to the internal rod and acting against bore wall to force the anvil ball against the opposing wall. Some of the "tabletop" gauges have similar provision through a pivoting brass arm actuated by a small coil spring. Without the "Gaddy mod", the Manson tuning fork type would be useless suspended from overhead joist, SUV or minivan deck or what have you as would be the tabletops.

jack