A pair of handholds is suspended from {HEAD ~ an arcuate guide plate}, which extends above {TAIL ~ a user station} 
extends above
A pair of handholds is suspended from { HEAD ~ an arcuate guide plate } , which extends above { TAIL ~ a user station }
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL