After trying unsuccessfully for several days to reassemble the vernier drive on my T-4XC, I noticed a small ball bearing on the carpet under my work bench. Since the vernier drive is the only thing I had been working on that had any bearings, I assumed that it must have fallen out of the drive while I was removing it from the T-4XC. It turns out that this bearing is used as a spacer inside the large shaft. After placing it next to the spring inside the large shaft, I was able to reassemble the drive with just a slight amount of preload. The preload required is only that required to get the set screws on the large shaft to fit into the notch on the main shaft. The main shaft is the one that moves the coil slugs. The preload needed can easily be generated by a medium size screwdriver and no special clamp is required. Although removing the vernier allowed me to remove all of the old grease, I am not sure the improvement over what was achieved by simply cleaning the drive in place justifies the extra work involved in reassembling the drive.
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Bill N0CU
