This serving tool works great and allows you to install nice tight servings on your bow string. Just make sure that you have the plastic spacers in between the serving thread spool and the serving tool. Also, there should be a thin rubber washer (similar to an o-ring washer) under the wing nut to aid in tension adjustment. My tool (in the serving kit) did not have this washer and I had problems with serving tension. I contacted Bohning and they sent me the correct washers.