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Amazon.cahttps://www.amazon.ca > ...
2pc Set Serger Knife Overlock Blade - Upper and Lower - Brother 925D 929D ... Return policy: Eligible for Return, Refund or Replacement within 30 days of ...
With lack of model number provided, Generic Videos below.
Usually, the lower blade should be changed by a technician. The upper blade can be replaced by the user, but the lower blade requires some minute specifications that use special tools.
Am guessing this is a serger. There are usually two blades in a serger (overlocker). Usually one blade can be changed by the home user, the other blade sometimes requires a technician.
Consult your owner's manual. It may have specific instructions about replacing the blades.
Sounds like your blades are either dull, misaligned, disengaged or broken. Examine your serger book for how to re-engage the blades. If they are engaged, make sure they are aligned correctly. If that still doesn't help check for damage.
For now, it works only satisfactorily:
I applied alcohol to further clean both blades,
dried and then oiled them. There seemed to be a slight gap between blades;
the fabric was dragged into the gap instead of being cut.
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