Hi, I have a soundgear and it's a five string. The bridge as well as having the screws to move the little cylinder things which the strings are on also has two allen keys on each little cylinder. What I want to know (sorry about brilliant use of guitar tech lingo) is what exactly they do and whether I should leave them alone. Just cos I don't know what they're called doesn't mean I don't know how to fiddle with stuff . If I adjust the bridge, which bit do I (or a shop) adjust, because I know all the barrels are at slightly different heights (the allen keys) and different lengths (the screws). Any info would be nice, sorry about the rambling.