John, I cannot specifically speak for Lionel's twin helical worm / worm wheel vs single helical however the Samhongsa twin and single helical worms will interchange with their respective worm wheels and seemingly work fine even though they don't mesh exactly the way they do when the correct worm and worm wheel are used. I am sure a mismatch causes accelerated wear but they do seem to work without much fuss. I have some photos in my other computer and will post the photos showing the skew angle on the two different worm wheels when I get home. j
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