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Gday Alan
That is VERY different to the older models.
The much larger dia wormwheel wil make it much more stable than the old units that had a tiny wormwheel.
At a rough count, the wormwheel has 78 teeth ( vs the 60 for a std ETX125), but the gearbox is also very different.
Would need to count all the teeth in the geartrain to see how they re engineered it to give the same final ratio.
Again, if it aligns and points well, then the ratios are correct, so its more likely they changed a few gear teeth counts to keep it the same.
Andrew
so what does the RA look like
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