The body has a base, {TAIL ~ a rear cover}, a front cover, a bearing seat and {HEAD ~ a middle liner ring} 
The body has a base , { TAIL ~ a rear cover } , a front cover , a bearing seat and { HEAD ~ a middle liner ring }
OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD