balancing weights hiting ball joint

New problim still no weight in the car meaning no motor,so there is very little tension on the t bars so i lowered it to the ground the upper a arm moved up like it should but now my upper edge of my a arm is hitting the balancing weight.My off set on thease rims is 4 inches thats the only issue i am having now.i had a friend once who ground a bit off his a arm to clear his rim is this a good idea.