alright so the old axle in my blaster has a 42 speller but I want the 40 that was on my 06 axle. the hubs are different shaped so I couldn't just swap sprockets ... so I pulled hubs and all and have been trying to swap them I've been trying like hell to get the newer one on the old axle but it won't budge any ideas? ps sorry for the dumb questions I'll have alot of then