WWP Razorback Blackwidow or Early Trracer stainless valve retaining screw NOS

WWP Razorback Blackwidow or Early Trracer stainless valve retaining screw. Some have orings but they are dried and cracked. One is included. ID is .296. Not standard. For use with WWP or trracer powertubes. For use with long WWP razorback powertubes (4 inch long). Valve retaining screw threads are 18 for WWP back bottle asa valve bodies. 18 is standard nelson valve retaining screw threads.