Pictures are needed here.
I recommend using thread locker!
I recommend using thread locker!
The studs should not be loose in A & B unless worn or wrong size or whatever. If it is only engaging A & B with two threads yeah that might be a problem.If I tighten the nuts on both studs up against the tube, the studs screwed into part A and B are both loose. I don't have room to add an additional nut on the stud. Here is a pic (as an attachment, hope it works)