I tend not to recall exactly what angle the angled riffles were at, but I might have that info somewhere. I do think the BGS device was about ten* from the stroke line. Also, Wilfley's table wasn't rectangular. It had been 19" with the con stop, and about 14" at https://safe-havenassets52727.mybloglicious.com/56327610/facts-about-copyright-investment-company-ratings-revealed