Forman told me to stop deburring by hand and I owe him a beer
He watched me fight a 6061 plate for 20 minutes and said my wrist was rocking the tool, so he clamped a block of scrap at the same height as the burr and told me to rest the file on it. Cut my cleanup time on a 40 part run down to about 4 minutes a piece. What's your go to trick for keeping a file flat on an edge?
Resting the file on a scrap block works, sure, but it only fixes half the problem. The block keeps the file at height, but it does NOTHING for the rocking that Forman called out, because your wrist can still tip the file off the block if you are pushing uneven. What fixed it for me was choking way up on the file and letting the handle end hang out past my pinky instead of gripping it like a hammer. Short strokes, like 3 inches, and let the teeth do the work instead of your arm. You will feel the file go flat the second both ends stop chattering. Also, a light pass with a fine file first to knock the burr crown off means the big file never digs in and starts the rocking in the first place. Try the short strokes and you will cut that 4 minutes even more.