Adjusting the pendulum shorter will cause your clock to run faster while lengthening it causes it to run slower or simply put speedup slowdown in the pendulum regulation diagram below look for the rating nut at the base of the pendulum which is what raised or lowers the pendulum disk or bob.
How to adjust antique wall clock.
Choose the proper size wood screw typically a 8 10 or 12 to fit the hanger at the top back of the clock and long enough to go securely through the wall into a stud.
On clocks with a pendulum move the pendulum disk up to speed up the clock or down to slow it.
Video tutorial showing how to adjust the beat of an antique grandfahter clock.
The clock can be made to go faster or slower by means of the nut at the bottom of the pendulum.
Simply count the chimes at a convenient time say 10 then stop the clock immediately.
Turning the front of the nut to the right speeds up the clock and turning it to the left slows it down in other words move the nut up to speed up or down to slow down.
Video tutorial showing how to adjust the beat of an antique grandfahter clock.
Turn the nut only a small amount each time.
Turn it to the right to move the disk up and to the left to lower it.
Move the hour hand backward and forward between the hour positions until the clock chimes the correct hour then adjust to the correct time.
Antique clocks wall clocks mantle clocks.
On clocks without a pendulum just move the time adjustment lever.
This depends how handy you are and on whether or not loosening the hands on your clock is difficult.
Use the adjustment nut.