The clappers

What is the derivation of "going like the clappers"

My references say that is US Black, circa 1920+ in origin, and is related to enthusiastic clapping during Gospel Services. I find this only just plausible. Any other offers?

I always thought it was to do with bells - the frantic movement of a clapper inside a vigorously rung bell. Mind you, this may just be me being delusional...

It may be, but sometimes fantasy and reality converge. I think going or throbbing "like the hammers of Hell" (as in bellhammers) is a related phrase.