Take the drip tip o ring off put dental floss in slot put o ring back on until it is tight, just a suggestion.
Thanks for the tip, Gimpy1261, but I tried that. I must have read it off one of your other posts, but it was still wobbly. I'm beginning to think the PT2 just wasn't made for just any 510 drip tip to be used in it. The drip tip "well" is just not deep enough, it would appear.