The XLine reel doesn't look like it can have the nylon screw added as the sides go up and over the reel.
If it could be added I might be tempted.
I'm hoping that one of the electric reel manufacturers does a good Black Friday deal 
It can it's the same reel as the power up HD but to get to it you have to take the reel apart. Problem is when you want to tighten it. I put a bolt in mine instead of screw and manage to reach it with a socket with an angle adapter. I was going to grind a hole in the side of the housing so you can access it with an Allan key but will probably just buy the overspin controller now.
Like I say if you only want one just buy the pure freedom honestly.
Great info, thanks. I am leaning towards the PF one as although it's not cheap it does look well built plus it gets lots of good comments.
Thanks.