Maybe Whirlwind makes a compatible blade? Or warp drive?
https://www.kitplanes.com/2020-propeller-buyers-guide/"WhirlWind Propellers are widely known and the company can supply blades for many other brands of ground-adjustable props."
"Warp Drive’s well-regarded blades are sold separately for use in some other brands of in-flight adjustable hubs."
"Airmaster builds no blades of its own, preferring to offer complete propeller systems in collaboration with existing blade manufacturers like Warp Drive, Kiev, WhirlWind and Sensenich."
What kind of hub does airmaster use?
Where did this guy get blades:
viewtopic.php?f=9&t=7483