Hope I'm not to late, don't pop it off, unscrew it like any nut/bolt(this just happens to be plastic) Adjustable whench will work, if you don't have the open end or closed end wrench..........Or a pair of pliers, no need to crunch it , it will unscrew easily.
As long as it worked.......... Before I answered the thread I went and unscrewed mine, so I could give the right info..... forcing it off is ok but not recommended, no harm no foul. Cheap to replace if it needed in the future.
Your Tie-down looks cool..........
Thanks! It was loose as i had unscrewed it a bit. It just didn't want to turn any further which is why I posted. I got it from Yospeed during the giveaway. wish they had blue.