Tighten the collar tight and cross your fingers that this works. Most collars have already been tighten to the limit. There is a seal behind the collar that is squeezed by two rings when you tighten the collar. You can replace the seal but it may quickly wear out if the ball joint is stuck.
There are tons of previous discussions that you can read to educate yourself. Like this one:
https://www.stovebolt.com/ubbthreads/ubbthreads.php/ubb/showflat/Number/604759
