So I noticed my chain is a bit loose and has way too much slack, I could hear it slightly hitting something while I was riding. Bought a stand to do the chain adjustment myself but I've run into a bit of an issue. The two pins, or sprockets (not sure what they are called) that stick out just under the axle bolt where you're supposed to hook the stand, they are missing on my bike. I've been searching online for someplace to buy them, the problem is I don't know what they are called . Been searching for a while and I cannot find them.