I've been trying go find an aluminum replacement option for my hydro cubs as well...especially when I had just bought a new OEM plastic one and it broke when it fell from 10" above the ground...I think the best bet will be a dehumidifier/humidifier repair place...the one in my 1974 monkey wards (gilson bros) is aluminum and attached to a larger split collar...I've been looking around.. Found a place, just waiting on size, blade angle, etc...
Good luck
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