When I used those bearings they had a rating for how much they could carry as
a steady bearing.
The locking coller was bored eccentric and fitted over the "spigot" that protruded
from the bearing. Slide it on, twist to "jam" the shaft and tighten the set screw.
The thrust load was rated as percentage of the bearing rating.
Your coller does'nt appear to fit over the "bearing spigot" but only rides against
You could use a teflon type bearing instead of a lignamvita bearing. I did that
on a rudder pintle bearing, worked well.
I think there are even better "plastics" now.