Hi I have what I beleve to be a 1933 Chevy 1/2 ton truck frame. On the front and rear springs have pins that look like 5/8 threds on the pin with tappers on both sides with a grease fitting. Most shackle pins I have sean are smoth and press in theas screw in to the spring hanger from the frame. Does anyone reproduce the pin? All of them apear to be about half worn out.Any help will be welcome THANKS