Explained to a lot of newbies, "The Service manuals are on the shelf" to those struggling and would only ask to save their butts. One new kid wanted to know how to properly run a DD Rack, so I ran one in front of him, he said "OK but can you do that slower so I can remember," I sad "NO this is a production shop, read the manual and get some practice, but keep a piece of plywood handy." He did not pickup on that last comment until one ran away with another tech. He always had his chunk a wood on the engine after a tune or rack run after that.