a timing gear carried by {TAIL ~ said housing} and within said chamber and having a predetermined number of {HEAD ~ teeth} 
a timing gear carried by { TAIL ~ said housing } and within said chamber and having a predetermined number of { HEAD ~ teeth }
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD