Amazon.com: Black Rubber Washer Large Rubber Washers 1" OD x 3/8" ID x 1/8" Thickness - EPDM Rubber Washers Flat Rubber Washers Round Rubber Washers (Pack of 25) : Industrial & Scientific
Regulating and Adjusting Watches Using Timing Washers • Adjusting Vintage Watches
Timing Washers - Large Adjustments to Watch Timekeeping — Harris Horology