I have that little 10" Craftsman saw, it's cute but effective.
Look on the back of the saw, there's a round black knob with a T handle between the saw and the knob on the same threaded rod. The T handle is the "lock" and the round knob will tilt the wheel to make the blade track down the center of the tires.
Put the blade on by releasing the tension first then see if the blade will track down the center of the tire. If not, you need to tilt the upper wheel just slightly. Unlock the lock and try turning the round knob in or out just a little. See what that makes the blade do. When you have it tracking pretty much down the center turn in the locking T handle and snug it up.
All this assumes that you haven't changed the blade guides from when it was tracking correctly...they may have to be recentered.
All this is assuming you don't have an owner's manual?
In which this should all be explained, if not call us back for further instructions.... :thumbsup: bill
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