サーキットブロックス™ - モーターシャフトキャップ - E-Blox®

Lost one of these caps under the couch for a week and the motor shaft still ran fine once I snapped a replacement on. Fits snug on the shaft, no wobble at all.

Wasn't sure a single little cap would make a difference, but it snaps onto the motor shaft tightly and the gear finally stays put during builds. Fit is snug, no wobble at all.

Lost the original cap somewhere in the carpet and this replacement clicked right onto the motor shaft, no wobble at all. My kid's build was running again in under a minute, which honestly saved the afternoon.