Dudley Lock Serial Number Database
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Find the first sticking point.
- As you turn the dial CW with tension on the shackle, you will come to the first clockwise stopping point where you can't turn the dial anymore. Make note of where it stops. Sometimes, the dial will stick right on the numbers, but sometimes the sticking point will be between the numbers. If so, record the number to the half (example: 22.5).[3]
- While continuing to apply tension to the shackle, turn the dial as far left (counter-clockwise) as you can. Make note of the first counter-clockwise (CCW) stopping point. The CCW stopping point and CW stopping point form your sticking 'range', for example, 22.5 to 10. (Note: Some 800XXX and 908xxx locks have a two number sticking range [for example, 28 to 30 and 10 to 12].)[4]
- Determine the first sticking point by finding the number that's in the midpoint of the sticking range. A range of 4 and 5 would have a first sticking point of 4.5. A range of 22.5 and 23.5 would have a first sticking point of 23.
- Each set of numbers that you find will have the same range. For example, one group may be 0.25 to 0.75 and another may be 0.5 to 0.25 on either side of the sticking points.