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I used rollers and channeling from panel-lift garage doors. The rollers are designed to move laterally to take up any variations in channel width or alignment.
I took my problem to a garage door place who were very sympathetic to my requirements, and actually supplied me with a heap of pre loved rollers and channel sections they had removed from customer installation during upgrades etc, and at very reduced pricing. Ideal for my situation.
HTH. Brian
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