Help with an old Pamlico 135T seat

I just purchased a used Pamlico 135T Tandem. I can’t figure out (I think there is a missing piece) how to lock the front seat in place. The tandem design is such that there is a metal tube attached to the back seat in the center. The front seat rides back and forth on this tube. There are locking holes on the tube, but I don’t know how to lock the seat in place on the tube. Any ideas?

Mine has a plastic barrel bolt on the back of the seat that locks it into that tube.


I ended up using a piece of 7/16th" diameter Delrin.

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