While you wait for answers, we may have found some information which could help you.
Click here for Brother 950i Knitting Machinethe middle button on my brother 891 carriage will not stay in?
KH 260 Brother Knitting machine?
Brother 840 punchcard gate peg problem?
garter carriage?
lace carriage compatibility?
Garter Carriage will not do knit stitch only yarn over needles selected for?