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That method is actually pants, drawing the bearing all the way through the BB shell is going to shorten the life of the shell!
It is actually dead easy with a hammer to remove the bearings and a threaded bolt and suitable sockets to replace. It takes a bit of nerve though!
Having said that I have 1992 Performance which still has the original bearings, and it was my winter and club run bike for many years, they fitted very high quality bearings in the factory.
adroit
Gaze in awe: http://forums.mtbr.com/vintage-retro-classic/replacing-servicing-klein-bottom-bracket-unit-massive-pics-596176.html#post6647517