I used the losi balls to replace the plastic ones that broke off .they are solid.. they were.50 cents each. not a bad fix. will they fit on the flybar link at the top? those broke on my sons eagle 50. He ordered a new flybar link.My large gear where it attaches to the metal shaft stripped out the set screw yesterday. i ordered a new patch for it .I might be able to drill it out and pin it I don't know yet. I'll try to fix it.