Most will suggest Ronnie Gilbert in Louisiana, and he is very good. Mark Croxton is also very good and does excellent work. Most are aging technicians in the propeller world. John Gibbs (AZ) has his son JJ on staff, Phil (Redding, CA) is over 70 easy and has a staff (great guy), Gene Struebble at Port City (Fort Smith), Precision Propeller (Old Hickory, TN), Steve’s Propellers (Texas), then Prop Dynamics in Virginia, the NE likes Spinelli Bros, and there are several others that are lesser known, like John’s Hot Props in Nixa.
Many spun out of small builders located in their areas.
BCB