In cog? Neato!
The rotor doohickeys, not the Q-tip. It's just there for scale.
I mangled one of these last week and was trying to decide if it was worth $5 to buy a new one ($2 for the part, $3 for shipping; "hey, can you just stick it in an envelope and mail it to me?"). If I do buy it, it would likely just lay around my workshop as the crank is already back on and I've ridden the bike.
Wouldn't matter, in my experience the doohickey referenced isn't all that effective at keeping the arm from falling off. And once the spline is buggered, it's game over. ?Ok, what's $5 and a few minutes of my time!
It is for the Ultegra crank I just put on my CX. I'd hate to be doing that ^ out on some dirt road miles from any civilization. Or anywhere for that matter.