As the pictures above show it appears that most of these are hand made with a purchased motor.
The only blade I found that could possibly fit was a standard size blade but I had to modify my motor for it to fit correctly. All works fine now.
Most dock/marine supply stores have blades. Getting one to fit yours may or may not be easy.
I have not seen a metal one.
Others can chime in.
I guess just travel from place to place seeking the blade you want. Get to the right retailer and they may have catalogs and order what you have.
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