The diameter of the head sprocket 8 must be sufficiently large to prevent development of excessive stresses in {HEAD ~ the wood fibres} of {TAIL ~ the wood components} of the assembly 7 
of
The diameter of the head sprocket 8 must be sufficiently large to prevent development of excessive stresses in { HEAD ~ the wood fibres } of { TAIL ~ the wood components } of the assembly 7
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH