{HEAD ~ The drive apparatus} can be modified, with the addition of a gear and chain, to reset or activate steel or {TAIL ~ other reactive targets} 
modified to activate
{ HEAD ~ The drive apparatus } can be modified , with the addition of a gear and chain , to reset or activate steel or { TAIL ~ other reactive targets }
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH REL OTH OTH REL OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL