Brother GTX pro Instruction Manual page 285

Put the capping pouch in its correct position.
(7)
< New capping pouch>
<CAUTION>

Avoid touching the portion (a) of cartridge. Otherwise, you may cut your hand.
<NOTE>

After closing the lid, the winding is complete when the latch of the cartridge side is raised.
Latch
285
(a)
Troubleshooting
X0295
Cartridge
X0296