Two pairs of {HEAD ~ like bracing members} hold the end supports of the support rollers, the bracing members of {TAIL ~ each pair} having one end pivoted to a respective hydraulic cylinder for the pistons and the end supports of the other support roller being detachably fixed to the other bracing member ends 
Two pairs of { HEAD ~ like bracing members } hold the end supports of the support rollers , the bracing members of { TAIL ~ each pair } having one end pivoted to a respective hydraulic cylinder for the pistons and the end supports of the other support roller being detachably fixed to the other bracing member ends
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH