Wanted: Base Screw for Optilock Scope rings

Need the screw that goes into optilock “ clamp “ to tighten onto integral mounts . This ring is 30mm and for Sako but I don’t think the screw will be specific to brand of rifle . Stainless see pics . If u have an orphaned Base ?? Can scoop screw out of it . Thx . 
Thornbury area Ontario .
Cheers