Millers Falls No.2 Eggbeater Drill Type Study
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Types K1 through K4 Spindle Thrust Bearing

The very first No.2 drill that used the LRRCW to control the running fit between the main gear and pinion gear had a very plain thrust bearing.  That bearing supported the force of pressing the bit against the workpiece being drilled.  The bearing was a simple cylinder whose position could be adjusted and held  in place with a small screw visible here between the spokes of the main gear.  That simple bearing was not easy to keep lubricated and had high friction compared to the efficient solution that appeared with the more heavily loaded Type K5 and later drills: a row of tiny steel balls between the upper end of the spindle and the inside of the spindle's bearing housing.