5 For each support rail:a. Attach a nut clip 5 at the selected hole in the back of the rack.b. Insert the two studs 3 of the support rail into the back of the rack. Hold thesupport rail so that it is horizontal, and push it forward so that the stud 2enters the matching hole in the front of the rack.c. Check whether the support rail is horizontal (a spirit level might be useful here).If the rail is not horizontal, remove it from the rack, then repeat step 5b.d. Insert the rail screw 4 into the nut clip 5 and tighten it.3-62 7133 Service Guide

IBM 7133 Series Service Manual