I have quite a bit of play in the arms of my Inspire 1. I have seen the videos of others with it and they suggest tightening the "bolt" on one side. Mine is perfectly tight but there is still movement and I am getting a lot of wobble when hovering. DJI Support told me to tighten the bolts but when they are already tight I'm unsure of what to do...

Any ideas?

Thanks.

The hex nut at one side of the centre knuckle can only be tightened so much, it runs out of thread.
And I think it is primarily to stop end-play.
The bearing shells within the knuckle, are most likely not getting compressed enough to overcome a very loose fit. Thicker shims would no doubt improve or cure the problem.
But the end result mustn't add too much friction as it could act like a brake and overload the landing gear motor.