Can replacement hardware be purchased for bi-fold doors? I know this seems
like a simple question but my local (little town) hardware/grocery
store/USPS office was thoroughly confused by the question. I would be
looking for the suspension hardware that makes the door move in the upper
tract (there is no lower tract on this door).

Is it worth replacing? Does the door function correctly with replacement
hardware or is it easier/less aggravating in the long run to replace the
whole unit?

Thx.
Giselle