By attaching it to the bobbin holder, you can adjust the tension on the thread using the brake knob.The center shaft that passes through the thread spool is made of brass with a weight of 9g/0.31oz.Even if you take your hand off the bobbin holder, the tension will not loosen and the material will continue to be wound.If you want more weight, please use the [CFT-67/M] Magnum Standard Gravity Kit (23g/0.81oz).●Can be used with all C&F bobbin holders. (CFT-60/SW standard salt water bobbin hol4der includes Gravity Kit as standard)●Please note that it can only be attached to C&F DESIGN bobbin holders.●Remove the two brake knobs, pass the center shaft through the thread spool and attach it to the bobbin holder, then tighten the brake knobs from both sides.
