Hi all. Almost finished my 7200 project. I took it for a quick test ride and the driveside crank arm started to wobble. I thought I was simply missing dust caps. Nope. No bolts present.

I'm confused by the crank bolt options. The bb and arms are both stock on this 2005 Trek 7200 multitrack.

The crankset is Shimano TX71 and the bb is a generic sealed cart with a square taper.

Hoping to solve my immediate issue and learn a bit more about common crank bolt types.

Gracias.