I've been doing intarsia projects the last couple of days and sawing a lot of 1" lumber. If you have done any intarsia you understand the importance of a perfectly square cut. I must say that I struggle with that. Occasionally even cutting puzzles. I've checked and rechecked my blade squareness. I think my left hand puts a bit of side pressure on the wood but not totally sure. It doesn't take much to put a very slight angle on a piece. It sure is frustrating.