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4mm ID THREADED PRECISION RINGS
Part Number: HP-LPRING-EP-T4
These are precision machined from hard aluminum to insure a wobble-free, perfect fit of APC E props to THREADED 4mm gearbox shafts, such as found in GWS-EPS400, HYPERION HP-XG-400, and some other brands. These are really necessary, as the stock APC 4mm precision ring isn't tight enough on threaded shafts to give a good center to the prop.