Malta sliding door rollers. Install in 1978

A quick learner from Cleveland,Ohio says:
The door seems to hang up sometimes. Tried to adjust the rollers,but it does not seem to help?
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Paul from SWISCO responded:
It may be time for new rollers. Since the door was made in 1978, it is possible that Malta was was using the 81-018 tandem roller for their doors. We also have them in stainless steel, the 81-149. Carefully compare our information to your existing parts to confirm.
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