Whidden Click Adjust Lock Ring
The Whidden Click Adjust lock ring makes your standard dies function like a micro adjust die. The lock ring will fit on any 7/8 OD sizer of any brand with adjustable shoulder bump. It's easy to use the inner and outer ring that can rotate independently of each other. Each click is metered in true 1 thousandths adjustment and has .100 total available travel.
Unfortunately this will not work with the Co-Ax press or the Dillon 550, 650.