Reebok New York Giants Eli Manning Jersey "treadmill tension" Questions

...treadmill and need to know exactly where to tighten walking belt? there should be 2 end roller caps, one on the left and one on the right. in these caps there will be an allen key bolt, turn each one ...

treadmill, model NTTL25900. The plastic endcap fits at the end of the walking tread and holds tension on the roller and belt. This endcap is cracked and I need a new piece. Unfortunately every place I