Edison patent 499879 shows the tension adjustment you speak of.
"The Screw C serves to adjust the frame A on the box B for the purpose of
tightening
the driving belt as will be presently explained, and the lugs b' are slotted to
permit
this movement the screw b being finaly tightend after the proper adjustment of
the
driving belt has been secured." Patened June 20th, 1893 and applied for July
30, 1888.
somewhere I have a few parts list for Perfected and class M phonographs. This
adjustment screw is located just under the left end of the mandrel, there
should be a casting that has this screw, as part of the bottom motor bedplate.
This can be seen in Fig 1 of the patent.
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