I think it works, ,and there seems to be a difference in opinion on how it works,,
Marc stated that he got better results reflexing the stave before putting the backing on,, either way, would work,, but some seem to think reflexing the stave , then putting perry reflex into that would give a better result,,
I made some 25 years ago,, I just had a straight core,, and then bent it into reflex when I glued the back,, with good results,,
if I was gonna do one now,, I would heat the core into reflex,, then put more reflex into it when I glued it up,,
then the chronograph would let me know if that was a good idea or not,,