The shim is then formed to include {TAIL ~ a feature} on its surface which complements the surface profile of {HEAD ~ the assembly surface} 
The shim is then formed to include { TAIL ~ a feature } on its surface which complements the surface profile of { HEAD ~ the assembly surface }
OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD