I ran a 5rl and 9 curved mag slot locks yesterday to do a small tattoo with my vivace and kingpin disposable grip. Ran great. They have very little tension compared to Cheyenne carts so I'm hoping they won't kill my stylus. My only beef so far is that the liner needles run in the center of the diamond tip, I'm used to having a conventional needle bent back to ride against the back corner of the diamond tip if that makes sense. I didn't have any ink splatter or wobble or anything so i guess that's just a personal preference thing .