G'day
GinoMany thanks for helping members out on this, and the great image of
the different approaches - original and work-around.
Mod BB and GM Gadge have spent considerable time problem solving.
You have clearly spent a lot of time too!

[I like the collar approach]
I feel the
ODK Store does offer a viable alternative [whilst stocks last].
It appears to be the cheapest on the market!
The Model 45 was released in 1968.
Mod BB has told me that the only sealed bearing used was probably the one
located in the Land Roll clutch sprocket - at that time.
A few years' later, sealed bearings were being used on the reel,
yet SB continued with the 'trolley bearing' for the rear roller.
I suspect SB continued with this design because it did a good job
[as a slow speed bearing], but also because any change would involve a
change to the bearing carrier [because it was a
non-standard size].
A great post on an esoteric subject, but an important post for
down the track.
Thanks Gino!----------------------
Jack