Facebook Twitter LinkedIn Pinterest Bluesky Threads cleaned it out for clarity. it loosened up while I was riding, a day of somewhat heavy riding. as you can see there is some "notches", or whatever they are called, on each 4 sides. should I use it? Crank arm worn? byu/HR60 insinglespeedcycling by HR60 Bicycle Bike Fixed Gear Fixed Gear Bicycle Fixed Gear Bike Single Speed Cycles