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