said ratchet wheel being secured within {HEAD ~ said chamber} by a C shaped clamp and {TAIL ~ a cover plate} 
by
said ratchet wheel being secured within { HEAD ~ said chamber } by a C shaped clamp and { TAIL ~ a cover plate }
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL