New 2A player question

I am a predominant 1a player but I broke my arm so I’m learning looping for the next 6 weeks until I’m healed up.
Bought a Loop 720 and when I opened it up to lube the bearing one of the spacers fell out. Tge spacer has a flat side and a side that is a little concave, but I dont know which side it’s supposed to be up against the bearing?
Tried it both ways and it seems a little too responsive on concave (barely sleeps, can hardly complete an around the world) and flat side plays a little too loose (hesitated before returning for next loop). I’ m sure it’s just a matter of getting used to a new yo-yo, just want to make sure I’m getting used to correct configuration. Thanks!

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720s are very responsive with their default setup. The concave side should be up for the bearing to rest within.

Thin string and better technique will help you keep the yoyo from responding preemptively. It just takes some practice, good luck on your looping journey.

Thanks. Much appreciated!