Need advice on installing BB’s on MG N&W J class driver rods.

I would base my decision on how it runs now.   If it runs smoothly, I would not mess with it.    It might go 20 years at the rate  you  run it, or more.    

If it is binding because the wheels get out of quarter, then you can consider such a fix in my opinion.

Don't do it.  If the slop gets too much, carefully enlarge the hole and solder in a short length of K&S brass tube.  Or just fill the elongated area with a layer of solder.  Consider a drop of oil on the pins now and then?

Ball bearings are wonderful in precision applications.  Model side rods are not a precision endeavor.  I use them only on worm shafts.

Oh yeah - MG crankpins were often brass.  You will need new steel pins.  Stevenson may have simulated bb crankpin caps, and Micro Fasteners has socket head flat head 0-80 steel screws.  Elegant!

bob2 posted:

Don't do it.  If the slop gets too much, carefully enlarge the hole and solder in a short length of K&S brass tube.  Or just fill the elongated area with a layer of solder.  Consider a drop of oil on the pins now and then?

Ball bearings are wonderful in precision applications.  Model side rods are not a precision endeavor.  I use them only on worm shafts.

True, true!

I’ve re-inspected the driver slop and found there isn’t as much as I thought therefore I’m going to leave well enough alone especially considering my intention to not run this piece excessively.  

Thank you everyone for your input,

Chris