What can I do if the steel poles used for a fence are uneven? They're all supposed to be the same height, but for some reason, they're uneven (ie. surface is uneven, the welder din't measure correctly, etc). Every pole has a plate at the top where I can insert screws to hold a 2x4 long piece of wood. The poles and the floor cannot be changed.
What can I do if they're uneven? I was thinking of maybe using washers to fill up the extra space, but there has to be a more elegant solution.