Also even if you get it super solid. It will develop some slop. It won’t get much worse after it initially breaks in but if you keep chasing the little bit of wiggle you will go crazy.
On my Assocaited DR10 I changed all the ball cups out for hemjoint style from 1/10 scale crawlers. Now the front suspension is super ridged. I did not do it with my buggy and the buggy is fine with the play in the ball cups.