That seems somewhat like how the parts matrix should be, or pretty close to how I already do it, but off a bit. So if you bill actual time, versus book time, how then can you give an Estimate before the repair? If you have a Mechanic who don't routinely make book time, or perhaps run into a snag, removing a part, you already quoted the job? Nothing worse than calling those folks back for more money. And even worse, if they arrive and your bill is higher than your estimate. I have never really had an issue , explaining mark up on parts. I tell them I could never get parts that inexpensive as they are online. I know that Repair Pal, is not our friend. Folks are looking that up, immediately after sending them the DVI. Also now with Napa's Estimator as well. But folks understand I am covering that part, for whatever amount of time, I advertise.