Dan, I think it's worth it - an old one I'd had for many moons (but hardly
used) was way off calibration. If I remember correctly, you can get your
T-wrenches calibrated by Sacramento Sky Ranch. (At least they used to).

They also make-to-order the nicest fuel and oil hoses for the engine
compartment I've ever seen. Swaged stainless fittings, Teflon lining, metal
mesh and integral fire-sleeves. Very comforting.

Dan Schaefer