adjustment screw for tamdem rollers pgt

A quick learner from punta gorda fl says:
How far can I back screw out without loosing adjustment ability?
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Paul from SWISCO responded:

Thank you for your question. We have known most PGT patio glass door roller assemblies have a 1" adjusting screws. I hope this helps answers your question. Please get back to us if any other questions come up. 

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