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
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