Do the bar end mirrors with the expanding metal plug thing, that rotate out of the way for storage, have any problems with slipping around, etc? They look extremely cool, I'll say that, but I've had some really awful bar end mirrors that flopped around. Any comments? I got these with the bike (along with the uninstalled vintage kit. The beehive tail light looks great, but the fit is sloppy, might need a little customizing)