Well ive done ring and pinions before but ive never installed a spool so I just wanted to see what I was getting into if I go that route. I unsderstand how a spool works but not a mini spool, I dont plan on ever using one but I would like to know how they work. So basically I just bolt the ring gear to the spool and the axles go in it and it eliminates the carrier and spider gears all together? I didnt know if you still needed to put the carrier in or not, I guess that wouldnt really make sense though.