I'd just remove it entirely.
You will need a pair of pliers and work it off.
then add something like www.Aquacave.com
They sell a black ribbed handle one that's nice, 21$, much better than clippard and just a few $ more.
The 1/8" mpt is teflon tapes right into most regulators.
So no leaks and strong connection.
These have provided steady flows for months on end.
From there, The Tygon tubing (aquaticeco.com) is the best tubing I've used to date.