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The flair tip started later... don't have my notebook on me for dates. The earliest superspeeds were made in the 40s. Off hand I'm pretty sure the 40s and 50s were just a continuation of the handle...

Wheb cycling the doors open and closed make sure and check that the blade gap is evenon both ends and both sides. I have even used thickness gages to take a measurement. They don't need to be dead...