CAVE: Bristol 447 clock drive motor

I am looking for a replacement motor for the Bristol 447 clock drive motor on my CAVE 12.5-in reflector (circa 1957)--I Googled it and an article says Cramer makes a replacement for this Bristol motor, but when I telephoned them last week I learned that replacement motor is no longer being manufactured. Any suggestions?

Terry Atwood
Shreveport, LA

Any clock makes two "hour hand rotations" in 24 hours. Any set of gears with a 2:1 ratio will work. the greater number of teeth in each gear, the greater the accuracy. 10:20 is good. 50:100 better, etc. I once made a barn door rig which worked perfectly for exposures less than 1 hour.