an excellent product and video tutorial here;
http://www.inkjetcarts.us/support/article/epson-nx510-refilling-startup-instructional-tutorial-video-inkjetcarts-damper-cart-refill-system-with-resetting-chip.html
the product is under the video, also here...
not recommending refilliing of factory cartridges as they aren't designed for it.
getting the air out of them is impossible to do the job correctly.
recommending refillable carts.
see helpful articles and embedded videos here...