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I recently acquired one of these in terrific condition with one exception, the power drum slide tension is too loose.
I seem to remember having a similar problem with one years ago and it being a pretty easy fix, but I have the cover off and I'm not seeing it. Can anyone assist? Bonus points for pictures :)
There is a friction adjustment under the instrument. Unplug the Vertometer. There are two small screws that hold a cover on the bottom of the instrument. Try not to loose the little screws, they are a sort of uncommon thread size like most of the screws used on the instrument. You will see some setscrews that press on a flat spring that presses against the power shaft, tighten the screws slightly to put more pressure on the spring