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To Tighten Cannon Pinion

From The American Horologist and Jeweler magazine, March, 1942

To Tighten Cannon Pinion

Photo by Harold W. Amster

To tighten a cannon pinion, I use an ordinary finger nail clipper. If the clipper is of a cheap quality it may be necessary to harden and temper the cutting edges. I insert a round broach snugly in the pinion (if a plugged pinion I hold the broach against the outside). Place the pinion between the cutting edges of the clipper, being sure the cutting edges are seated exactly in the original dents; then withdraw the broach slightly and give the clipper a firm squeeze. If not tight enough, repeat the operation. The straight outside edges of the cutters allow a pinion to be dented very close to a square shoulder if necessary.

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