This is my Mk II bearing mod. 6mm dia PEEK thrust pad in solid brass end cap with pocket machined using a 7mm end mill cutter in a pillar drill. Retained the collar at the top which holds extra oil (Straight SAE 20).
Also found that "Chemical Metal" is not impervious and sweats oil so moved to "JB Weld" to glue everything, takes longer to dry, but ultimately is stronger.