I've got an RPM hang and erratic idle issue that has recently developed. So I pulled my dual 75mm Kenne Bell throttle body apart. The brass gears had a solid 1/16"+ of play. Compared to a OEM throttle body that has zero play. The main brass gear with shaft slides out once the blades are removed. The secondary gear can then be replaced with an OEM plastic gear. So I'll have one OEM plastic gear, one brass, once reassembled. Also waiting on a new TB motor to ensure no issues. I'll report back if this is the definitive fix to resolving this issue.