Need help with cranks..

I was riding home yesterday and realized a screw came out of the crank thats connects the arm to the sprocket. Any idea what tool to use to tighten the screws/bolts? And where to possibly find a replacement screw…

You just need an hex driver and in a perfect world a chainring nut wrench. Park Tool Co. (Can also use a large flat screwdriver, but this can do more harm that good to the nut.)

I would advise against using any kind of thread locker on chainring bolts, rather use something like anti-seize.

awesome! thanks dude.