For those that are removing previous versions of the fins, now is the time to prepare for removal. Don't expect to crack the loctite with an L-shaped allen wrench. And with nylon washers, heat may not be an option either.
Will shared some tips and I will share what worked for me the last couple days to remove mine.
If you have the 5mm Allen head bolts, be sure to go buy a 5mm Allen socket. It's the best way to be sure it's the right size, and you can put max torque on that sucker. If you have standard hex head bolts, you probably already have the tools.
Normally heat is the answer, in this case impact, and probably a few hits with a hammer. In fact, for mine, I struck the head a few times with a hammer to potentially loosen, the loctite. Then tapped the Allen socket in to be sure I was utilizing as much of the wrench in the allen head bolt as possible. Then I hit it with an impact wrench. This worked on 2 out of 4. The other two, I spun and ended up grabbing onto the bolt head with a big-ass Vise Grip. They all came out clean. Worst case, I was prepared to pull the nozzle off, and put it in a vise if the vise grip could not grab. That was not needed.
It would be wise to run a tap into those threads on your nozzle to be sure they are clean for the new hardware before assembly. Take extra care not to cross thread. And avoid using power tools when assembling. That's a sure way to mess stuff up if they start wrong.
Good luck everyone. Those of us in the second batch will be waiting to hear results in hopefully one week before the holiday from you first batch guys!