If you have this screw on a Jaguar shear, be gentle with it. It is brass and breaks easy. You may want to soak it in oil before trying to adjust it. Replacement screw comes from Germany and are hard to come by. We have a limited supply and sell these screws, even though they may not be on the website. Part number #JSSS. Call 770-972-4332 to order.
If you are a sharpener and want more education on these unusual screws, we recommend the Sharpeners Guild Convention www.nbtsg2015.eventbrite.com or the DVD on screws by Josh Freund filmed at the Sharpeners Jam. http://www.bonika.com/screwing-around-with-josh-freund-pivot-screw-know-how/ — at Bonika Shears.