Thanks Cucco.
So after some Noalox and working back and forth it has loosened up...
Both my regular length extension tubes work perfectly...smooth and easy threading with 100% flush fit with the top of the tube.
One of my 18650/Kick extension tubes now threads easily with 100% flush fit now.. The other 18650/Kick extension tube does not..
I found the problem with the one tube that wont let the Strata screw flush.. The threads were not cut as deep into the tube as the other 3... The threads stop at the top of the vent slots where as the other 3 tubes the threads go to the bottom of the vent lots.. David I know it will still fire but I like it perfect.. Is there anything that can be done to correct this issue? New 18650/Kick ext tube or can I send this one in to get threaded deeper?
Hmm.. I guess I should test my extension tubes. I just assumed..................