Page "Change ringing" Paragraph 10
from
Wikipedia
The rope is attached to one side of the wheel so that a different amount of rope is wound on and off as it swings to and fro.
The ringer pulls on the sally and when the bell swings up it draws up more rope onto the wheel and the sally rises to, or beyond, the ceiling.
After a controlled pause with the bell on or close to its balancing point, the ringer will ring the backstroke by pulling the tail-end, causing the bell to swing back towards its starting position.
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