So this kinda just turned into what’s your favorite weird or obscure tool thread.
This has gatta be one of my favorite
It’s just a little plastic cap that helps you slide the seal on, it’s easy to catch the inner seal lip on the cut outs for the cotter pins. This negates that. Defiantly the worst tool since it sees very little use but I still love it. I recently picked up a whole factory v1 tool kit and it has 3 of these, one for the pedal shaft, one for the sprocket shaft and one for the crank. Close second is the tool to hit in the sprocket seal pictured below the cap. (edited)