Both such adjustments can thus be readily achieved from {HEAD ~ the exterior} of the device by {TAIL ~ simple manipulations} on the head of the bolt 
by
Both such adjustments can thus be readily achieved from { HEAD ~ the exterior } of the device by { TAIL ~ simple manipulations } on the head of the bolt
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH