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Stewart Warner Cadet Speedometer

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halfatruck

I live for the CABE
This has probably been on the forum before, but before I get into too much trouble, does anyone know the basics of the inner mechanism of this speedometer? I have the tenths and mile 'rings' free and turning, but they don't seem to affect each other or try to advance any of the other 'rings'.........
 

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I think I have this part repaired (disassembled/oiled/reassembled) now........anyone know what causes the needle to jump??
 
After much fiddling around it looks like the magnet is too close to the 'cup' above it, if I put together with leaving a small space it doesn't jump......
 
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