Here's an attachment based on my Viking press arm. It serves as a supplemental piece for any standard power rack, and its sword-hole design can turn your rack into a multi-purpose muscle-building machine. Use it for presses, rows, bench work, deadlifts, and more.
The payload arm on this attachment can be moved frontwards or backwards to fine-tune the exercise resistance without changing changing the weight load. This attachment also provides a unique torque curve, and for this reason it will train your muscles quite a bit differently than a regular barbell will.