Well JV, you got a heck of a chuckle out of me. Thanks! I like that thermometer. This approach implies paint after the bearing installation. That's opposite of my current approach. I have to ask, why heat/shrink over greased pig? :)
Been thinking Darren and with the mass of aluminium in your gearbox casting you'd be better off with a propane torch than a heat gun. It should be sizzling hot when you spit on it. That plus freezing the earrings and they'll almost slide in - jv