A handy tool for removing damaged or worn striking caps on both Model 31 and 21 Span-Hammers. 

Simply secure Span-Hammer in a bench vise- slip knock off tool in grooves of Span-Hammer and gently tap off old cap.  To install new striking cap, start cap on Span-Hammer with hard twisting motion, then seat cap with a mallet or another Span-Hammer.