Solid roller lifters...

For you Bakerlite, you might learn something.
Bosch Automotive Handbook 9th edition, 1544 pages.
Page 328 Hydrodynamic brgs: ' To ensure reliable operation of a hydrodynamic sliding brg, it is necessary for there to be a load-carrying lubricant film over a wide operating range. This lubricating film is created in a radial brg when the shaft is eccentrically positioned. This in turn generates a lubricant pressure. The rotating shaft delivers the lubricant into the brg gap.'