sim motion maintanace ?

[Krow1956]

hi: I have the prosimu T1000 3 motion, was curious about the 2 roller balls or roller bearing's on the traction loss end, i'm wondering what would be the be maintenance for these, when installed I noticed a hole in top of each one is there meant to be a grease or oil schedule one should consider, I must admit this came with the worst possible instructions almost not at all, thanks for any insight