my brother has a John Deere 790 that whenever he hooks up an impliment, it sways back and forth when using it. The three point hitch arms appear to be attached to the tractor via bushings with very short toggles to take up. In fact all the adjustment is taken up and still sways. He has drilled holes in arms to try and take up slack , but that should not have to done. No similar issues on my Kuboda! What is the remedy that is recommended?