This opening portion is in contact with {TAIL ~ ball} 12 at the minor axis position of cam 7, i.e., at the position of the X X axis in FIG 5, thereby preventing retainer 13 from moving in the direction of {HEAD ~ outer race} 11, as shown in FIGS 6A and 6B 
This opening portion is in contact with { TAIL ~ ball } 12 at the minor axis position of cam 7 , i.e. , at the position of the X X axis in FIG 5 , thereby preventing retainer 13 from moving in the direction of { HEAD ~ outer race } 11 , as shown in FIGS 6A and 6B
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