Originally Posted by BruceMetras

More than a spacer, the yellow clip is to keep the coupler from accidentally disengaging while riding.. some have reported years ago that their foot contacted the sliding sleeve while pedaling, pushing it inward, then the pedal was not secure and it would release.. the yellow clip once installed makes it impossible for the sleeve to be pushed in with the resultant release of the pedal.. as I said, I ride with and without the safety clips, but then my foot is probably more stable over the pedal because of the Power Grips..