Availability and cost of standard J frame replacement hammers is driving some to use the less expensive body guard hammers as they usually sell for less than half the price of a standard hammer used in model 31s, 36s, 37s, etc. Seeing the number of standard hammers with broken thumb pieces (spurs) for sale on some of the auction sites it evident that many 36s and 37s have been dropped. The supply of standard hammers is drying up other than those that come from the folks salvaging parts from the evidence guns sent to the crushers.