This forms a cutout or {HEAD ~ depression} for {TAIL ~ at least one guide segment} of the guide device 
for
This forms a cutout or { HEAD ~ depression } for { TAIL ~ at least one guide segment } of the guide device
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH