62
8-1-2021
APQS.com
Lenni – Lucey Oparation
D.
Bobbin Case Brake Spring
•
Bobbin Case Brake Spring Removal
To use magnetic bobbins, you must remove the bobbin
brake spring from your bobbin case. Use a small
screwdriver or other flat tool to gently pry the brake
spring out of the case. Put the spring in a safe place, and
reinsert it when you switch to any other bobbin style (it’s a
good idea to purchase a second bobbin case if you like the
magnetic core bobbins so that you can leave the brake
spring out of the case permanently on one of them).
•
Bobbin Case Brake Spring Replacement
To reinsert the brake spring into the bobbin case, position it so that the small “fingers” point out. These will be
slightly raised compared to the rest of the brake spring. In the photos that follow, the Smart Bobbin case (Photo A
below) has a brake spring that has two straight pieces of metal that look like fingers bending slightly up from the
bottom of the case. The Big Bobbin case in Photo B has U-shaped fingers that also bend up slightly. These
“fingers” apply pressure on the bobbin once it is inserted into the bobbin case, it will stop the bobbin from over-
spinning when you stop sewing or change directions.
Align the shorter “cut out” edge or rounded edge of the brake spring with the cut-out opening in the bobbin case,
making sure the brake “fingers” point out away from the case. Use a small screwdriver to force the outermost
“pins” on the spring back into the slots that are on the outer rim of the bobbin case. The brake spring should snap
firmly in place with the small brake fingers facing outward.
For magnetic core bobbins only!
No Brake Springs
Depending on the size of bobbin case you have, your
bobbin case brake spring will look like either example
above. The one on the left is from a Style “L” bobbin
case and the right is for a “Style M” bobbin case.
Photo A
Photo B