ORIGINAL: Frank Schwartz; Odd, Hal DeBolt flew one and it was flawless, but I could not get him to tell me how he modified it so it worked.
I know that circa middle 1960's there were a few corrective diagrams posted in magazines on how to correct some bad diagrams which had been circulated around. Hal wrote once and mentioned that he sent entirely whole wrong diagram, and was then in process of correcting it. Never saw the corrected one though.
Last time I communicated with Hal had to be in early 2000 or about Christmas time.
Wm.