Rigid Brass Turning/Torsion Wrench can be filed to press fit each type of keyway and let the person feel the cylinder move. When slightly underfiled to fit the keyway it is pressed into the cylinder bottom,and the clinder and T/T Wrench moves as a unit.
The CHAPION 6 LEVER padlock when diassembled reveals triangular levers
with a sidebar moving into place as the levers line up. If we look up the Patent Date then a year can be determined. I believe CHAMPION came years before MEDECO?
Making picks for CHAPION Padlocks may reveal some insights into picking sidebar locks? A file paper clip works well and the modified paper clip also works BEST locks, as well as Tubular Locks.
Sandman ..................................
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