Deskjet 500C 

The Color Cartridges for the above printer do not have access holes for refilling.
It is necessary to cut away or drill part of the green cartridge top so that the vent holes for the ink chambers are accessable. The chambers may then be filled with about 4cc maximum of the process colors available through Doug Kron at 216-587-2024 or write for pricing to P.O. Box 25591 Garfield Hts., Ohio 44125. I will send you a price list for volume inks.

The drawing below shows a way of drilling your cartridge so that each chamber may be filled with ink using either a pipe bottle or hypodermic needle. Drill using a 3/16 drill and follow the measurements on the drawing. Each chamber holds 4CC DO NOT OVERFILL!!!  AND FILL SLOWLY!!!
After filling cover the holes with a plastic top coat tape 3M Magic Tape or I use Electricians tape (plastic not Cloth.

After printing a few times with the cartridge top off each color if you do not allow the cartridge to run out of ink you will have a cartridge that will last you for a long time.

Please see the attached PCX file