If a clock doesn't chime at the correct time, the minute hand can be removed and adjusted. If the chime is more than a minute before or after the proper time, remove the minute hand and make changes to the hand bushing. The hand bushing is the small raised area on the back of the hand. It can be grasped with a pair of pliers and the hand can be rotated around it---thus adjusting the minute hand's position on the clock.
Using a pair of thin, needle-nosed pliers, carefully remove the nut that holds the minute hand in place. Rotate the nut counterclockwise while holding the minute hand. Hold it near the nut, so you don't bend the hand.
Grasp the hand with your fingers adjacent to the shaft.
Pull the hand straight off the shaft. It should just slide off as it's not screwed to anything and you can now make changes to the bushing if you want to.
When you are reattaching the hand, turn the hand nut finger-tight. Verify that the hand is pointing to the correct position on the dial. You could record the time that the clock starts to chime before removing the hand, then stop the pendulum and remove the hand. Make your bushing changes, and then replace the hand. It should point to the position you recorded, plus the corrections you made when you adjusted the bushing.
Don't over tighten the hand nut if you put the hand back on.