Phosphor bronze is the best bearing material however brass is adequate for the amount of side pressure that is made with a shaft and a brass bearing of about .250" (6.35mm) in length x 2 (one at each end).
Silver Steel BS1407 Tolerance for diameters less than 1" are ยฑ 0.00025" on nominal diameter.
So measure your stock bar and go for a clearance for a plain bearing fit of
Minimum 0.0010" = 0.0254mm
Maximum 0.0015" = 0.0381mm.
In terms of producing this "FIT" its best achieved by drilling 0.0010" smaller than required size and then reaming (without coolant)
Reamers can be made to produce plus or minus from their stated size but this is something only an experienced engineer would be able to do.
So If you are using only drills, first drill about 0.015" smaller and then with the finished size. If a test drilling produces a hole oversize then again a drill can be made to drill smaller by touching the outer points with an oilstone to slightly blunt the cutting edge, we are however talking a small amount say 0.0005" to 0.001".
Finally lubrication is essential so an oiling tube should be fitted of greased on a regular basis.
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