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