Had the same problem when I first got my Hawk. When you have it adjusted to the slack you want I learned to use a wooden dowel rod 3/8 inch or so (a large screwdriver can work in a pinch) placed in the sprocket teeth gap. Rotate the tire rearward until you have taken all the slack out and the chain is tight. Hold the tire with your knee so it does not move and then tighten the axle nut applying force to the wrench and the ratchet ONLY in a forward towards engine direction (do not pull back toward you).
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