introducing reinforcing material to a cavity at {HEAD ~ an angle} of less than 90° with {TAIL ~ respect} to said conduit 
with
introducing reinforcing material to a cavity at { HEAD ~ an angle } of less than 90 ° with { TAIL ~ respect } to said conduit
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH