I have an old (1870's) Lenzkirch (sp?) horse-style wall clock (3-weight) that appears to be all original. However, ever since I got it, it's been running about 15 minutes fast per day. I haven't found a really good clock man locally that I have enough faith in to really look into the problem.
The only ideas I can come up with is to lengthen the pendulum (currently lowered ALL the way, however), add some weight to the pendulum, or change the suspension spring.
My question is: could this be solved by doing something simple as I mentioned, or does it look like it will be something more complicated like a mismatched gear train or something like that?
If anyone thinks that I could solve the problem by changing the suspension spring, please let me know what steps I would take to begin investigating how to do that. I.e., do I just measure the existing spring and decrease the thickness by 0.0005" or something like that?