SWISCO - The Replacement Hardware Authority

not sure what i have

A quick learner from Portland, OR says:
Just bought a 1964 home with sliders replaced sometime post '80 (I think). The hole for the adjustment screws exists, but there is no screw nor does it look to be a threaded hole.

All ideas welcome!
Michael
User submitted a photo of patio door hardware.
Profile picture of Paul
Paul from SWISCO responded:
Looking at your photo, it seems that the previous owner either broke off the adjusting screw head or removed it. If the door rolls properly, then you can just let it be for now. If not, or if you want to replace them anyway, please remove a roller and send us a few photos to be identified.
A professional from California says:
Have you checked about 2"-3" inside the hole?
Usually the screw is not near the surface.
My first guess for this roller would be 81-082.
No guarantee, but see if that looks right.
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