A knob 52 is integrally attached to the fastener 48 at the end thereof opposite the washer 50 for allowing a user to regulate {HEAD ~ the fastener displacement} between the second arm 44 and {TAIL ~ the shelf} 62 
A knob 52 is integrally attached to the fastener 48 at the end thereof opposite the washer 50 for allowing a user to regulate { HEAD ~ the fastener displacement } between the second arm 44 and { TAIL ~ the shelf } 62
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH