Bonehead just left my house - came over for a visit, which means his wife allowed him to go out in public; this is a rare thing because he is ugly enough to frighten women and small children. He doesn't own a computer and only has a dumb phone so if he wants to see something on the net, he comes here. Anyway, he actually read this entire thread after I showed him how to scroll with the mouse wheel and he said that while I mentioned the push block a few times, he felt it is important enough to make an issue of it.
Bonehead doesn't just use the block to apply force into the belt. He steers the tool with it and he feels it is a key to grinding accurately, especially if you're a newbie and are grinding to a line. He is adamant that only plywood will do; something about the different layers grabbing the edge of the bit better.
His physical repulsiveness aside, Bonehead is probably one of the most intelligent men I know. He only has a high school education but he is an amazing engineer, the best I've ever seen. He grinds tool bits that are works of art and hones them to a mirror finish so despite the fact that he is coarser than a 24 grit belt in his speech, he does know what he's talking about. You might want to listen to him.
His parting shots to me: " You're too wordy and repetitious, and you write like a girl. "
Le Sigh ...