Exactly how do you adjust velocity?

[lilbmxer]

I know you mess with the dwell, but what do you do, and where do you do it? Is it with an allen wrench or something, or is it simply a thing you turn? Nothing i've come across has mentioned this in further detail.

[Rancid Coleslaw]

The dwell and the screw cap on your max flo. Check your manuals.