I have to adjust this door and hope some one is familiar with it. The ones I am used to have a locking

nut and a fixed nut. You loosen the locking nut and turn the fixed nut to adjust the door.

This one has two locking nuts only. The bolt has a round head which slots into the carriage at the top and

I assume is threaded into the fitting attached to the top of the door. But how to turn the bolt?

The only thing I can think of is if the locking nuts were tightened together then turned as one would it turn

the bolt. ( I just thought of this so haven't tried it yet )

They carriage is the long ball bearing type and the mob that supplied them 9 years ago has gone out

of business and I don't know the maker.




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