Your positive it's the limb? I only ask because occasionally I get a small piece of dirt or something in the cable slide and it creaks like that too. I would swear it's a limb, but isn't. Anyways, check that too.
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1995 Ford Ranger XL
Douglas Radial Tires
Super Blue headlights
Fiberglass front bumper
2400 pounds
i had the same problem recently with my trykon xl, it was the bushings on the cam axles on the outside of the limb where the string loops on. had to put it in a press and remove the bushings and filed them just a touch, totally took care of the noise. hope this helps.