The slots are dimensioned to provide {HEAD ~ a friction engagement} with {TAIL ~ the knives} carried therein 
with
The slots are dimensioned to provide { HEAD ~ a friction engagement } with { TAIL ~ the knives } carried therein
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH