I ended up grinding the hole out on the axle instead, it sits in there pretty snug, without any play. I figured that if I ground the head of the bolt, I would have to continue doing so every time I messed around with the leaves. SO I ground out the hole to fit the head of the bolt perfectly.

2000 Chevy Tahoe nothing special. 1990 Isuzu Amigo, 3" lift, 31x10.5x15 BFG All Terrain (Street), 33x12.5x15 (offroad), Pacesetter header, some ATM rash. More mods to come......