The SafeTcrowder retrofit is kit designed to improve safety of up-cut saws. Mounted on the saw, the device positions rollers on both sides of the blade; these can be pushed forward to hold material against the saw fence. Anti-tie-down triggers are located on each grip. Both hands are clear of the top clamp and saw blade when the saw fires. Both triggers must be engaged simultaneously. (515) 232-2953, RazorGage.com.