A tapered clock pin of brass or steel is inserted through the end of the
arbor on which the minute hand rotates.
Between the pin and the minute
hand is a collet (washer).
To remove the hands, carefully remove the pin
with a pair of long nosed pliers. Remember that being tapered, it will only come
out one way. If there is not enough protruding to get a grip of, you can push it
out with another smaller pin. The collet, minute hand and hour hand can then be
pulled off. Sometimes the hour hand has a clip or small screw retaining
Your Own Clocks by Mervyn Passmore