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