C&F Standard Gravity Kit consists of a brass center shaft and brake knobs. Shaft adds weight to the bobbin and creates more tension when leaving the bobbin hanging freely. Brake knobs let tier to adjust the spool tension freely.

C&F Standard Gravity Kit features:

• Adds weight
• Brake knobs allow tier to adjust spool tension
• Compatible with all C&F Design's bobbins (doesn't work with other manufacturers' 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
• Made in Japan