“My watch has stopped - Why?” -  Page 5

The Crown Wheel, No. 25, is engaged by the winding mechanism. Worn teeth on it may do considerable damage to winding parts.

The Ratchet Wheel, No. 26, has a double function. It winds the Mainspring and also regulates the release of power to the amount required by the escapement. The consequent wear frequently rounds the square hole; or the teeth may break, making winding of the watch impossible.  The Ratchet Screw, No. 26A, holds the Ratchet Wheel to the Barrel Arbor, 24A.  When broken, both must be replaced.

No. 27, the Hour Wheel has a tube to which the Hour Hand is fastened.  The same shock which breaks a crystal may also jam this tube. The Minute Wheel and Pinion, No. 28, gear the Cannon Pinion, No. 19, down so that the Hour Wheel will make one revolution to twelve made by the Cannon Pinion. Both this and the Intermediate Wheel, No. 29, often break when rusted.