I have a clock on which the great wheel has slipped on the winding arbor so that it won't hold the spring tension. Is that easy to fix, or can anyone recommend where to send it to get it repaired, or would it be easiest to buy a replacement, but where?

G. Alan,
Can you post a picture? Attachment of the first wheel to the arbor is not universal. Replacement may be an option, if we could see what you have. Dimensions of the wheel, tooth count, diameter, etc would also be helpful.
Regards,
Dick

Hi Dick,
Here are some measurements:
Arbor
total length= 2.36"
diameter at wheel= 0.25"
arbor pinion= 0.18"
length betw plates= 1.33"
Wheel
diameter= 2.75"
no. of teeth= 84
Spring width = 0.75"
Key width= 0.14"
I would apreciate any advice you can offer.
Thanks, Greg