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55 deg versus 60 flank angle?
Pitch is 8 TPI, which you can count between one inch of your open vernier on the adapter.
The hub diameter is a tricky one, don't know it out of my head.
Also, you may not be able to measure (count) inside the 2-ear spinner
Do they actually have the same taper as the 3-ear ones?
If I remember correctly, the wire wheels are centered differently.
Dom
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