I purchased a Ridgid 10 Inch Cast Iron Table Saw – model R4512. I’ve assembled it, however when I step on the pedal to move it with the caster wheels, the lock slips off after moving it a couple of inches and it comes crashing down. Does anyone have any clear instructions or pictures as to how these casters get assembled and installed? I’ve double-checked them but can’t seem to figure out why the saw won’t move / roll properly. Thanks in advance.