This is for an 4mm scale gearset with a 1.8mm bore on the worm gear, that looks to be unused. The drive gear has a 1/8" bore.
Pair of 4mm Scale xxmm bore Worm Gears Unused #12
4mm Scale 30:1 1.5mm bore Gearset Unused
4mm Scale 1/8" bore Gearset Looks Unused #9
4mm Scale 1/8" bore Gearset Looks Unused #8
Branchlines 4mm scale Brass Boss 1/8" Bore with 10BA Grub Screw Factory Sealed
Joblot x 18 Ratio 4mm Scale Accessories/Kits
