Had bike on stand this weekend and figured I'd inspect and grease front wheel bearings. It's been awhile since I dealt with old fashioned loose ball bearings, so thought I'd ask "the experts" here. Between the bearing cone and locknut, is there supposed to be a small flat washer? If not, should it matter? I did notice it did allow a normal thickness 11/16" wrench to be used to hold the cone, while snugging the locknut vs. without it, so I left it on. just curious?