I break my engines in on a Black & Decker workmate. I cut a 2x4, screw a piece of plywood to the end with tee-nuts placed to fit the engine mount I intend to put in the plane. I start my break-in with the 2x4 cranked into the B&D, engine upright, and run upright until I have set the high and low speed needles. When I like the needle settings, I then rotate the 2X4 to side mount or inverted, whatever I intend for the final mounting mode. I adjust the fuel tank in every case to center vertically on the spray bar, since that's how I mount the tank in the plane. I save the nose-up test for when the engine is in the plane and ready to fly. Convenient height, I can lay out my tach, timer, tools on a card table I take to the field with me and set up beside the B&D. I can sit down at picnic bench and record rpm's and head temps, other notes I want to keep, and let the engine run by itself unattended. I find I get the engine broken in and tuned in maybe an hour, and like the man says, no more deadsticks. I also like to have the engine tuned before the model is ready, because when the plane is ready to go, I hate farting around with engine issues that keep me from flying. If flypaper can get some of my engines in the air in three minutes, I'd like to watch and see how he does it.