I just finished mine using your method RODOMO with another mod.
I used a R16RS bearing which took only 5mins with coarse emery paper on shaft to fit make it but had to shim outsideof bearing in tube to make it atight fit.
I cut the useless section away.

Then cut the old nylon bearing bush in half and used it as the back support for new bearing by sliding it down the tube and screwed it in with 3 stainless steel screws from the outside.


Then cut new slots for the original wire clip to fasten bearing.

Some paint, all done.