The printer worked from Tray 1, but the pickup cycles were growly. Turning the pickup rollers backwards by hand produced ratchety sounding clicks, as from gear teeth jumping.
It turned out that the mystery part was a gear spindle that had slipped out the side of the autocompensator arm. Here's a view of it.
There's a whole row of these spindles up the length of the arm. The loose one slid back into place easily, restoring normal 'feel' to the gear-train.
I dabbed both ends of each spindle with CA adhesive. (The uppermost spindle is a bit difficult to get at.)
This post tells how to get the autocompensator out of a T652.
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