The original Brother LC-103
cartridge is made not to be refilled.
If you want to refill, you have to refill the LC-103 refillable cartridges
which are made to be refilled and are easy to refill as
You can purchase a set of Brother LC-103 refillable cartridges
LC-101 and LC-103 are
Printer ink and Refill kits for your Printer