Clocks, Watches/clock running slow

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Question
bentima 8 day 130-20 ?  strikes half hour and on the hour west german 74.clock was cleaned and oiled with clock products.Runs slow 15 mns a day set at the max.speed.Clock has long vertical bal.spring.could this spring be weak?

Answer
Hi Joe,
The first thing to check would be the amount of swing the balance is making. Are you getting close to 360 degrees rotation of the balance? If not, can you estimate how far it is turning?
Thanks
Michael
www.norkro.com
clock parts and repair

Clocks, Watches

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Michael Radi

Expertise

Clock repair and clock parts questions.

Experience

I have been professionally repairing clocks for 17 years. I owned and ran a clock shop for 6 years and I am the owner of the clock parts supply company; www.norkro.com

Organizations
National Association of Watch and Clock Collectors

Education/Credentials
High school graduate, some college, graduate of Niles Bryant School of Piano Tuning and repair.

Past/Present Clients
I perform about 20 clock repairs per week.

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