2015 EC 300 Countershaft seal

[braaaplifejonesing]

So I'm pretty much stuck. I don't have an auto mechanic grade impact gun and I can't seem to get this clutch baskets nut loose. I only need to move the clutch so I can remove the kicker shaft assy right? I can't take it off without removing the clutch I tried several times. not enough room unfortunately. so what tricks are there to remove this nut. I flattened the washer. it won't budge. its not reverse thread right?

I can't seem to find anything to hold while turning it other than the (old used )countershaft sprocket on the other side being driven when I apply pressure.