Yes, the early plunger model has nipples on the side to grease anyone passing. Later versions '52/53 have nipples to the rear. For the application here I would rule out a simple casting and surmise them to be forgings, which are the same for all years, differing only in the position of the drillings for the grease nipples. The spindle slot lengths are different on each side. The chain side positions the hub to tension the final drive chain. The slot on the other side then allows plenty of leeway to centre the wheel. From experience it takes several goes to get it right. If greasing passers by is a problem, substitute the nipples for blanking plugs and teach critics a few new words, about going away and multiplying.
As for setting up, anyone capable of tuning a guitar from scratch will have no problem, its the same principle. Chain tension and alignment and wheel centralisation are all inter-related, just like guitar strings....perfect tuning until you re-check that bottom E. Then round you go again.
Part numbers. 67-4125. Nearside, brake drum side.
67-4126. Offside, right hand side.
On these carriers, Grease Nipples face to the rear, info taken from October 1953 parts catalogue.
Swarfy.
