No need for two threads on this, but I think you are creating a problem where none exists. On 50Hz, the speed of the Lenco motor will be different from its speed when running on 60Hz. True. But the standard drive shaft is tapered so as to allow nearly infinite adjustment of speed between 16 and 78 rpm. So, I don't think there is really a problem; just slide the idler wheel forward or backward along the tapered drive shaft, until you see proper speed. If we were discussing a Garrard, the situation is different, because no such speed adjustment mechanism is built into the Garrard 301 or 401.
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