This reminds me of conversations about skateboard sizes. People go on and on about the difference between an 8.0 width deck and an 8.125, lol. I skate an 8.25, 8.125, and a 9. I can pretty much do all the things I can do on all of them, as long as I have wheels on the ground (or most of the time, anyway). Really the more important stat is wheelbase. It's like that with rods - it's all about the bend. I'd buy that AVC70MM off the shelf, and be done with it. Mine is probably more than a decade old now, still catches, and works for so many things that are cranky.