Rotate the minute hand on the clock to the next hour. Let the clock cuckoo on the half hour every time you rotate the hands.  Count how many times the clock cuckoos.  Next move the hour hand to the number the clock cuckooed. The hour hand is on the shaft friction tight, if the hour hand feels loose just use your two thumb nails and get under the minute hand and push down on the hour hand close to the shaft.  After you moved the hour hand to the correct hour rotate the minute hand to the next hour (remember to let the clock cuckoo on the half hour) and count how many times the clock cuckoos. Now the clock should cuckoo the correct time.  To reset the clock just move the minute hand clockwise (remember to let the clock cuckoo on the half hour) till you reach the correct time.