Hi there!!

After reading several posts on the weak retracts on the Global Avance, I decided to pull mine out for inspection.

This is what I have done to reinforce the retracts to prevent the legs from rotating.

Upon pulling out the leg, after loosening the screw holding it in place, I decided to file a flat spot on the opposite side
of the already filed flat spot and put in one more ellen-key screw to hold them in place. Rinse and repeat for the other retract.

Ta da!! 2 screws holding the leg tight!! No more rotating wheel legs!!

While you are at it, u might want to consider strengthening the retract plywood support with more epoxy or CA.

Hope this helps.