HERE AT BIRDFINGER IT'S SOMETIMES IT'S THE SIMPLE THINGS THAT HELP THE MOST AND WE LOVE BRINGING YOU SOMETHING FIRST.   BRASS LINK BALLS WITH AN  M1.4 THREAD TAPPED RIGHT DOWN THE CENTER.  NO MORE FUMBLING AROUND WITH THE TINY NUTS WHILE TRYING TO INSTALL YOUR UPPER LINKS ON YOUR CHASSIS.  JUST REPLACE YOUR LINK BALLS WITH THESE AND RUN THE SCREW STRAIT THROUGH THE SCREW BALL.  QUIT PULLING YOUR HAIR OUT LOOKING FOR THOSE TINY NUTS THAT ALWAYS END UP BURIED IN THE CARPET  NEVER TO BE SEEN AGAIN.   GET YOURSELF SOME SCREW BALLS.  (m2 threaded Screw Balls comming soon)