The position of the tray is maintained by {HEAD ~ a fastener} which extends through the clip member into {TAIL ~ a friction fit relationship} with the shelf 
extends into
The position of the tray is maintained by { HEAD ~ a fastener } which extends through the clip member into { TAIL ~ a friction fit relationship } with the shelf
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH REL OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH