One advantage of using the 772 carts is no fancy syring efforts are needed, just use a razor to cut the paper label holding the bottom cap which has a chip in it, pull off the cap from the 772 cart, and put on one from an empty, or near empty HP70 cart of the same color. If you are lucky, it should just work. Of course you will not be able see the ink level in the HP utility or in the ink levels monitor panel. Just pull out these tall carts periodically and either weigh or shake to judge ink status.