once you have it lined up properly, file off the burrs.
line up the collar and spring.
install the shift cover. these shifters are nortoriously finnicky. before you call it done. cycle the shifter 20 times. yes, that's right, cycle it 20 times, and if it works everytime, THEN you can call it done.
we still have a small gap. a teflon washer with a 20mm ID, a 24mm OD and a 2 to 2.5mm thickness would fill that gap nicely.
on this particular reel, the preset knob was loose. i had that problem on a number of my own personal boss two speeds. if you bump the preset knob ever so slightly, you can get BIG changes in drag settings. to fix that problem, i used a new o-ring and got a much tighter fit. it can actually be alot of effort to turn the preset knob with the new bigger o-ring, but it's better that than have a slight bump increase your drag from 15 pound to 20 pounds without you even knowing.
ok, there you are. a boss 600 extreme with TWO anti-reverse roller bearings, a thicker o-ring to keep the preset knob from moving on it's own, #2 phillips head countersunk screws on the reel seat instead of the allen heads, and a monster 6/0 kolekar handle grip. the only thing you need besides the two AR bearings to complete this upgrade is a teflon washer with a 10mm ID. i'll have to check the local hardware stores for those. if someone with a machine shop can knock out a teflon washer that is 20x24x2.5, that would be great! i would have to check. the 2.5mm thickness might me a smidge too thick.
when i finally put it together, i noticed that the aluminum handle was loose. the square hole of the handle arm had gotten a bit tweaked. a stainless steel handle arm would be a better bet. i will talk to my machine shop guys about making one. another project for another day. for now, i present to you the only boss extreme reel that i know of that has two anti-reverse roller bearings. you can now increase the reliablilty of your boss extreme reel without having to get a new side plate that has dogs. jigging guys want instant anti-reverse. if that's what you want, then the accurate boss extreme boss reels with these two massive AR bearings will now give you the most instant anti-reverse hold of any reel in the world.