With the information above, loosen the expansion set screw in the middle of the bar or remove it completely. Set the glides so they just barely lift the Miter's protractor off the table surface. Your Miter should slide easily in the slots. It is unlikely your Miter bar is bent but if it is you will have to replace it. It is part number 518104 Miter Gauge Bar. Remember when adjusting the older style glides, as shown in the link of my earlier post, they adjust from the top and it is the same hole that the set screw goes into for attaching a Miter Gauge Stop Rod (as shown in the picture below) to the miter. If present, the set screw needs to be removed to adjust the glide.
Mark V 520 S/N 09-11-01 completely upgraded to Mark 7, with all SPT's & more.
Model 10ER S/N R64000 first one I restored on bench w/ Shopsmith metal ends & retractable casters. Has Speed Changer, Model 4E Jointer, Jig Saw with lamp, a complete set of original accessories & much more.
Model 10E S/N 1077 oldest one I have restored. On bench w/ Shopsmith metal ends & retractable casters.