benpost wrote:
no i dont think there is a bottom rail. another question, the bottom
screw allows the claw to pull in or out, and the top screw seems to
just tighten up the claw and reduce play, but what is it meant to do?

Top and bottom screws do not always wrok the same way round.

One will pull the claw in/let it out. That is, moves the cupboard in the
horizontal plane.

One will pull the screw down/let it go up. That is, moves the cupboard
in the vertical plane parallel to the wall. Often the claw will not move
if you do this when holding the bracket in your hand. Try pushing
upwards against tha claw to see what happens.

--
Rod

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