Yes Chip, that sounds right. Beech installed them in many Bonanza airplanes in the fifties. Back then, Bill Coverdale would bring his bright blue Ka-6 to my Dad's gliderport south of Miami, FLA, in the winter. He wrote an article, actually a letter to the editor as I recall, in SOARING about removing the restrictor from a "Memphis." A search of the magazine archives may be worthwhile to anyone interested.

His brother Miles Coverdale (often sporting a big bow tie) wrote many articles primarily on training and safety and was the "grandfather" perhaps of our current Soaring Safety Foundation, of which I am Trustee (which in the southern states, means a trusted prisoner!)

Like you and your Dad, I was lucky to meet, through my father Fritz Compton, many of the legends of soaring from that golden age and listen to the discussions of "how to" which they shared willingly at the single national "open" contest or at one of the regional events each summer.