How to refill HP 75 901 OEM Cartridges. Support manufacturer's label and locate refill holes. the syringe with correct color .HP 61 Tri-Color Refilling Instructions DatatekUsa and these refill kit instructions are not affiliated with, Locate the correct filling holes: . The plugs in the top of the HP tri-color ink cartridge can be pushed into the center of the cartridge without damaging the cartridge. Use a syringe to inject . In this guide I show you how to refill HP 302, HP 304 HP 62 tri-colour ink cartridges from home with very basic equipment. This can be done with very cheap .