about 10 years ago, on this site, there is a poster name Gandhal, he try to teach his daughter to spin the ball, he saw all the kid use western and bush racket up, he is a guru, try to find a way to do it without western, since western limited the potential to hit thru the ball. every body laugh at him and humiliated him.
There is a poster name NEE, he bite the idea. he with the ball machine try to brush up the ball at contact. in 2 weeks it's too hard for him for the timing, so he think it out: hold your forearm and supinate, you will have a pronate automaticly latter. The result is excellent, he has time to supinate then he let the natural pronation occurs. it really help him time the brush easier. He then represented to Gandhal. and Mr Gandhal call "WINDSHIELD WIPER". that name was born by then.
and that poster NEE is me, 10 years ago, I left tennis for along period of time due to accident and injuries on my shoulder. I cannot hit my 1hbh no more, then i find all kind of way to hit 2hbh, all kind of information, all kind of book go thru my eye, not a whole lot reward. until i read the old copy of Dough King: "The hands have it". i start to hit with only body as he shows. he did not call the push and pull then, it was called by easytennis.com. i think. I try very succesfully with the forehand and after inspect all pro that can see in several recently in tournament, the way they hit 2hbh as i did: with body only. i was succefull easely with push stroke apply to my 2hbh. that's all i can say
you have you head, just think, think and don't disrespect people who has different idea than you.