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We need to know if it was made by Samhongsa or Ajin to know which gear box. Likely NSL does not have a direct replacement and the drive gear on the axle would have to be replaced.  Samhongsa has been out of business for some time and what I have done in the past is try and find a junker to scavenge a gearbox. Most of the non articulated locos used the same gearbox however there were two versions of their gearbox one with a 21: 1 ratio and the second with a 42: 1 ratio. Both used the same drive gear on the axle so the case with idle gear worm wheel and worm will fit regardless of the ratio.  The only difference between the two is the 21:1 box uses a duel helix worm and the 42:1 uses a single helix worm.  The 42:1 is a real PITA as to run a scale 60mph the motor is turning over 10000 rpm and literally screaming. Add to that if the flywheel is the least bit out of balance or eccentric the whole loco will vibrate like heck. So the choices are a NSL gearbox and you have to change the drive gear on the axle then re-quarter ALL the wheels not just that one. OR, find a junker with the 21:1 gearbox.  Then hope it has a good gearbox.                            j

I replaced one on an old Williams 4949 with a NWSL.  As mentioned by other people so far, I had to remove the gear from the axle and press it onto the NWSL axle.  It wasn't too difficult.  I used the puller to remove the gear from the axle and pressed it back on with a drill press which is not really the best way to do it. Same with the drivers.  Again, not the best way to do it, but it worked.

@Tom D. posted:

I replaced one on an old Williams 4949 with a NWSL.  As mentioned by other people so far, I had to remove the gear from the axle and press it onto the NWSL axle.  It wasn't too difficult.  I used the puller to remove the gear from the axle and pressed it back on with a drill press which is not really the best way to do it. Same with the drivers.  Again, not the best way to do it, but it worked.

Very clever, how did you manage to keep the drivers in quarter ?          j

Getting the first one on was easy since you just press it on at a 90 degree angle.  I pressed the other one on with the first wheel at 12 o'clock and the other at 90 degrees from that and slowly pressed it on with the drill press.  It worked, but it was tedious and I checked it as soon as I got it started to make sure it hadn't rotated.  At that point you can still adjust it slightly left or right making sure to keep it square.  Then I pressed it the rest of the way.  That worked, but if I was going to do any more of them I'd find some type of quartering jig.  What I did is too easy to mess up.

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