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Examples of Poor Restorations:
Here are some examples of poor restorations by other clock repairman and clock owners. The most common is a poor practice called Drill N'Fill. These rotor would have likely had long lives if it weren't for someone thinking they could simply drill a hole in the rotor and fill these rotors with oil. Telechron clocks will likely live on for decades/centuries but their rotors need professional restoration. The rotor parts damaged in these restoration attempts are not replaceable except from other "organ donors".
Even if a Drill N'Fill aim was lucky you could still end up with shrapnel inside the rotor that could bind up the gear train at any time. In addition, the oil quantity in a rotor needs to be precise. Too much will slow the rotor down. Too little will cause a short life and noise.
I never Drill N'Fill Telechron rotors and I guarantee them for satisfaction upon receipt and 1 year replacement!!
Bad aim:
Notice the mushroomed drill hole binding the gear:
Drill bit took out a chunk of gear:
There's another poor repair practice which uses a hole closing punch to tighten up
worn bushings. This is a short lived repair. The proper repair practice is to replace
the bushing with a high quality KWM or Bergeon bronze bushing then use a cutting
broach followed by and smoothing broach to achieve a perfect clearance fit with the
pivots. (proper clearance fit is absolutely critical for these high RPM rotors).
A properly done re-
Apparently this repair person couldn't figure out how to properly bush a rotor so made a piece of brass to stabilize the worn bushing surrounding the inner pinion gear.
I don't slice open rotors to remove and rebuild the gear trains. It shortens the critical length of the case and makes any future rebuilds much more difficult. It looks like this repair person had to use a pound of solder to patch these rotor halves back together.
