Attach a level string line on the sagging girder beam by tacking a nail diagonally into the lower corner of the beam at two points as near to the ends as possible or at a minimum spanning the depressed floor area. Leveling floor joist with shims if you have an uneven floor you may need to think about leveling floor joists with shims. A slot in the side allows you to install and remove these washers without completely disassembling your joint.
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