MAINTAINING HOOK:
On clocks with exceptionally heavy pendulums there is usually a device
called a maintaining hook. It’s purpose is to keep pressure on the escape wheel while
the clock is being wound, Without this it would be possible for escape wheel teeth to
be bent when the escape wheel turns slightly backwards and the verge end catches the escape wheel tooth edge. Most vienna regulators have them. Most large grandfather
clocks have them Always look for the gear on the main wheel (it is usually spring
loaded). It usually looks like a large ratchet wheel. If the wheel is there but there
is no hook, then expect problems with the escape wheel. Make a hook; and install it or
have nothing to do with the clock because the escape wheel will eventually be damaged.