How to tighten a Manfrotto 680B

<p>I have a Manfrotto 680B that has been slipping down on me during the last few weeks. After some research, I've learned that I could fix this issue with the little plastic wrench that came with the monopod.</p>

<p>The problem is, I have no idea where I placed that wrench. I've read that I could use some type of hex wrench, but in looking at the top clamp on the monopod, where it needs to be tightened, I can't figure out where I would tighten this.<br>

Can anyone help me?</p>

<p>It is a metric allen key. You tighten the allen screw in the locking mechanism.<br>

Losen the joint, tighten the screw a bit, lock the joint. Repeat until you get the tightness that you want.</p>