Quick question about adjusting chain tensioners. I have two bmx style chain tensioners on my single speed, track fork bike. To adjust the chain tension, will I need to loosen the axle bolts and then move the rear axle along with the chain tensioners. Or, can I simply use an allen wrench to adjust the screws on the back of the chain tensioner. Sorry for the silly question, I'd just feel a bit foolish asking the local bike shop yet another newbie question.