You know what's funny Kiwi?
i remember seeing those ads in the back of M+F when i was a kid and through the years the measurement got bigger. The first time i saw it i was like 12 years old and it said 19 inches, and through the years it went to 20, then 21
Never knew that, lol. I only saw his ads a couple of times back in the 90s and it mentioned 20". Of course, back then, I had no idea that the mags weren't exactly the gospel of truth.