I asked the same question repeatedly and the consensus I got was Moroso Climbing Gear
Oil and two tubes of GM limited slip additive, both available online through Jegs. I learned later you can 'tune' by varying the amount of limited slip additive you use by adding an ounce or two at a time until it operates smoothly around corners but I have not tried this. No complaints about the Moroso and GM combo in my Jag Powerlock.
Rick