Spool adaptor to fit a hard drive bearing/motor. The internal diameter is 25mm for the bearing. The minimum spool internal diameter is 52mm. It would suit spools from about 54~65mm internal diameter. The overall external diameter is 80mm. The base is 5mm thick, and the overall height is 25mm.
Designed for use with this top mount spool holder bracket:
See also, this remixed version which adds slots for greater compatibility with different spools:
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