Hi Mac, Well I installed a ZERK fitting and proceeded to fill my PP with Molly grease and they run very smooth and above all pretty quiet. Mine are all running at 9756 to 1 with normal gears, slow yes, but I am turning 4 yagis on 2" by 1/2" WT 4130 X 176,000 PSI 28' foot mast that weighs over 300 pounds plus the antennas. on a 70' Sky needle. Running them on 28V DC as original. Hank KN6DI