On initial fitting I had drilled the taper pin hole twice. The initial hole took the taper pin off of square with the tail spring socket. Welded closed the small end of a hole through the Flyboys Sonex tailwheel. Re-drilled small end by centering a 3/8" Cobalt bit in large end clamped in a drill press vise. Used a #1 S&J taper reamer to open the hole. Boelube helps with drilling and reaming. Used reamer to take a little material from the tail spring to fit taper pin. Cleaned up surface of rust, painted with a self-etching primer and finished with rattle can red enamel.