French silk suspension running too fast

[JTD]

The silk thread is so flexible that the pendulum would have a tendency rotate without the square peg in the square hole to keep it lined up, at least that's what I understand.
RC

I think you are likely correct - I had never thought of that being the reason, but it makes perfect sense.

I haven't seen very many silk thread suspension clocks.

I have seen lots of them, and it still didn't occur to me! You're never too old to learn, as they say.

JTD

 

[heifetz17]

This clock has a recoil escapement, and RC the pendulum you posted is the one I’m currently using.

 

[R. Croswell]

This clock has a recoil escapement, and RC the pendulum you posted is the one I’m currently using.

If you are using that pendulum and your clock is running too fast, apparently you cut it off too short. You trim the pendulum so the movement keeps time, then if it doesn't fit in the case, you either have the incorrect pendulum, or with this one, you will know that the base of the case is missing and must be replaced before you can use that movement in this clock.

RC

 

[heifetz17]

I installed a new pendulum at full length, and the clock now loses 3 or 4 minutes per hour, so success! I’ll begin my adjustments to pendulum length, and straighten the crutch, then come up with a creative pedestal for the case. Thank you all!