A stack of
loot boxes prize crates treasure chests on the Squidwrench Operating Table yielded a big box of torque drivers, two of which now grace my collection:
As with clocks: when you have more than one torque wrench, you don’t know what torque it is. The black driver had a solder blob in its adjustment socket, obviously intended to prevent unqualified people (that would be me) from bungling a production-critical calibration.
A suitable drill in a pin vise put a hole down the middle of the blob:
Turning a tap into the hole produced enough traction to yank the solder shell straight out of the hex. Whew!
The red driver goes to 30 lb·in, the silver to 30 lb·in, and the black to 100 oz·in. The red and black now agree to within maybe 4 oz·in, which I think is Good Enough, and both within 4 lb·ft of my Harbor Freight 200 lb·ft clicky wrench, which probably doesn’t mean much at the low end of the wrench’s scale.
The silver driver refuses to agree with anything, which suggests somebody else monkeyed with its calibration before I laid hands on it.
More calibration is needed.