{HEAD ~ This upper mould half} also forms the spring well and contains {TAIL ~ a removable core plug} 
contains
{ HEAD ~ This upper mould half } also forms the spring well and contains { TAIL ~ a removable core plug }
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL