I spent 3 hours Saturday trying to get the shim measurements right after an overhaul of my 5sp gearbox. We had the right plates and a handful of depth measuring gadgets. I (and about everyone else there) kept getting different measurements. The box would get closed up, and be too tight. Then, do it again and the output shaft shim (which is visible before the seal goes on) would be loose. One guy had been at it for 4 hours by that time. I finally gave up and had to get home. I think using those indicators takes more skill than most of us at the tech day possessed. Today, I tried a method I'd read about. Place little pieces of hollow-core solder so the ends sit across the outer races. Heat the cover and install and torque. Then take the cover back off. Measure the squashed solder, subtract 0.05mm, and you have your shim specs. It worked perfect, and took 15 minutes instead of the tedious afternoon of ultimate failure. Plus you don't need a $70 flat plate and a $100 indicator. Or much skill.