John, hope you have made some headway in your search for direct replacement parts. However if you have not I think you can get what you need from Boston Gear or KHK-USA, others. Many years ago I sent stripped gears worm and wheel to Boston and they sent me back exactly what I needed. If you contact them they may be able to do the same for you. What is the number of teeth on the worm wheel ? You can rest assured these are not custom cut gears they are stock items Most of the gears in Samhongsa boxes were .5 modulus which is the metric term for Diametrical Pitch. Say that worm wheel was 16 tooth at .5 modulus. The diameter of the worm determines the skew angle on the wheel's teeth. This alone gives the gear houses all they need to know. Trying to count the teeth in your photo best I can tell is about 16. That is part of the problem a small diameter does not load as many teeth so each carries a larger load. I would be tempted to replace the bronze worm wheel with steel and use delrin for the worm and treat it as a sacrificial part since it is easier to replace. Attached are a couple of documents from gear suppliers that you may find helpful. j
https://www.bostongear.com/-/m...info-spur-gears.ashx
KHK has a similar document to Boston Gear but more metric in their terminology.
