I need a lift out section over a loft hatch. I have base board either side and a bridge section with lugs, bolts and clips trying to hold it in position but it still goes out of line after a few weeks, I suspect because all of the woodwork moves (the bolts no longer fit comfortably). It feels like what I need is something that will adjust the relative height and lateral position at each end of the bridge on a screw thread. Does such a thing exist?