Not to split hairs, but
, dblKick asked about hammers on a club vest. If you're asking about a HA clubber -- HA does not release info on what the smaller vest patches, and symbols, mean. (That whole rico thing?)
SS lightning bolts, on a guy wearing SOA gear, probably means the guy has an eBay account, revolving credit, & a poor self-image. LEO's report, on a HA member, it means the wearer is an assassin (Filthy Few) for the club. The HA decline comment.
It's commonly accepted: The hammer became marketable after numerous hammers turned up at crime scenes suspected of having HA involvement. They replaced tire irons because they were not vehicle specific (premeditation/intent issues), inexpensive & easy to purchase, and
they sink. They are reportedly still in use.
I agree that the hammer is a popular HA support item, but part of the allure/mystery of the HA is that you have to be HA to really know what items actually mean on a HA vest.