the "cones", so you've repacked the hub, you then put your axel in and put the cones on, you tighten them both until they can't go anyfurther but you want 0 play in the axel/hub, and you want it to spin with little resistance (if this makes sense), so you then put on your lock nuts. once they're locked on see how it spins and how much play there is; if there is no play and it doesn't spin well (it's to tight) take 2 17mm wrenches and loosen the whole assembly (lock nuts on the hub are usually 17mm), vice versa.