Green Axles.

I am changing out my 3:55 pos for a 3:23 open in my driver Dart. The 8 3/4 has Green Axle bearings. I have read up on this and am more confused now than I was then. This washer in the spider gear section they say has to come out or leave it in , it's a pin, I see no washer or washers.
So what's the deal?

i've used cut down by moser C-Body axles, moser axles and dr.diff axles over the years with green bearings and have never had to remove that button. can't say about other axles.