Ny-Lint Mobile Dragline Conversion

[9W Monighan]

The spacers need to be faced square with each others end You probably chucked them and they were not running true. Then when you turned them around to do the other side it was running out again. Before you do that, try rotating them some so one will counter the other and maybe it will sit flat. Sometimes the flat bar stock will bow when you machine one side only due to surface tension.
All of the "I" beams I made for my dragline had a bow until I machined the other side.