In the case of the Dark Magic, the yo-yo halves can be loosened to a certain extent, thus widening the gap, and the vice versa. Over time though, you'll break in the bearing, aka the lube in the bearing will wear out, and the yo-yo will sleep longer because there is less friction in the bearing without the lube, but the yo-yo will be less responsive.
Velocity and/or Speed Dial would be a good idea, since they can be easily turned from responsive to unresponsive in a twist. THEN don't forget, the other stuff you need...I'd suggest getting Yoyojam thick and thin lube and the most important of all: string. You'll use string reaaaally fast. Most yoyoers buy string in packs of 100, for about $10.
OK, so the DM's gap can be made wider which helps you land string tricks but in order to keep it responsive you have to maintain lubricant. What is the difference between thick and thin lube?
