Learn what a loose or tight cannon pinion does to hand-setting feel, minute-hand security and long-term reliability.
The cannon pinion is the friction fitting that carries the minute hand and allows hand-setting. It must be tight enough that the hands do not slip during normal running, but free enough that setting does not strain the gear train.
A loose cannon pinion can let hands slip and destroy timekeeping confidence. A tight one can make setting harsh and stress components over time. Both are service issues.
What happens if the cannon pinion is loose? Hand setting may feel too easy, and the minute hand can slip under normal conditions.
What happens if it is too tight? Setting can feel hard or risky, and the mechanism may be stressed.
Can this cause the minute hand to jump or drift? A loose fit is a classic reason hands do not stay reliably set.
Is this a DIY adjustment? No. Cannon pinion friction is a watchmaker adjustment.