Not sure what you mean by (3) sockets. Do you mean there are a TOTAL of three contact points at which the Rotisserie touches the BBQ? Two points (inside, left spring-plate and right-side inner drive?) and ONE point on the outside where the actual powered motor shaft inserts?
Also, if square drives have more play why do they make the ONEGrill motor you sell with a square drive? Seems like a hex drive on the motor would have less play, no? Also, what if your KK has a square drive and you buy the roti kit, will it fall forward 1-2 inches on its rotation? Do you recommend the cradle or spit? Sorry for all the questions, but it is a bit of a mystery...