{HEAD ~ This drum wall} 5 has on the outside {TAIL ~ a plurality} of plastic elevations such as mandrels 6 
has
{ HEAD ~ This drum wall } 5 has on the outside { TAIL ~ a plurality } of plastic elevations such as mandrels 6
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH