"Ziggur" wrote in message
T...
In article ,
says...

For some time the "roller" catches at the bottom of the door had been
catching on the channels, thus requiring me to nudge the bottom of the
door
to open it.

Have you tried adjusting the rollers? They work on a cam. Usually a hex
or star screw to adjust.

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thanks .. I'll bear this in mind if trueing upo the door doesn't fix it ...