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Product Description
These are the M of the 8mm Stub Hubs.
The M is 14.8mm from the center of the pin to the hub face.
They use 4 locking nuts on the back for threads (they should be glued in place for convenience but be careful not to add glue to the threads).
They use a 2.5mm pin and I cut the shank of a cheap 2.5mm drill bit for pin.
I use these shafts from aliexpress or ebay on my projects: Hsp 88321