Originally Posted by
Finlay1967
No, the crank bolt is on the opposite side on crank arm and is a black bolt which needs a specific key to tighten. I have tightened the two bolts to the top and side of this main black bolt but I still have this wobble in the cranks and the crank arm eventually comes loose after a bit of riding.
You have a hollowtech crank. The black "bolt" is a preload bolt, meant to squeeze the crank arm on.
For any shimano product still common in the world, you'll be able to help yourself by going to their
technical documents repository online.
Search for your model number, which should be on the inside of the crank arms, and start there. SI documents are the installation instructions and will walk you through the recommended installation procedure.