This issue can occur when the feeder's sliding part is not securely tightened on the rail. As a result, the carriage feeder selector pushes the yarn carrier before it reaches the central part where it is meant to move the carrier. Consequently, the feeder tip is slightly ahead of its intended position, causing it to collide and break needles.
This is an example of this problem:
To fix it, the sliding part must be tightened onto the rail. It must have just a tiny bit of play, as little as possible, without clamping the feeder on the rail. Once adequately oiled, it has to move smoothly in both directions.
Instructions:
- With a 3mm hex key, untighten the two screws to release the position of the bottom mobile part. You'll notice the feeder has two springs inside to provide a gentle adjustment with the rail.
- Move the mobile part upwards towards the rail, and tighten up the two screws. That will lock the feeder.
- Untighten the two screws just a bit, enough for you to be able to slide the feeder in both directions. This movement back and forth will loosen up the clamping force a bit (make sure the rail is slightly oiled)
- When it slides smoothly but firmly, tighten up the screws. If the slider gets too loose on the rail, repeat the operation until the feeling is the same with all the other feeders.