Okay I thought I would finish this thread off for closure and future reference.
After unsuccessfully trying to break open the mouse, I located four screws underneath the feet-pads. Unscrewing these screws allows the mouse to come apart. I ended up completely taking the mouse apart, for fun. The only issue I could find with the mouse wheel was that the rubber ring-grip wasn't a tight fit around the wheel itself, which resulted in a little bit being raised. In turn this was rubbing against the outer-shell of the mouse, as there is not much space separating them. Filing down the outer-shell around the mouse wheel fixed the problem.
