If the Bolt is overtightened, it can be damaged. We recommend tightening to a max of 2.5Nm. The best way to approximate this without a torque wrench is to use a small hex key oriented lengthwise inline with the Bolt. Then tighten firmly. In practical terms, this means you should slowly tighten the Bolt until your Bell doesn’t rotate easily on your handlebar, then stop. Note that the Bell should move upon impact to help prevent damage during a crash.