A threaded rod extends through the flanges with a lock nut threaded onto one end and the nut engaged against the outside of one flange, and with {HEAD ~ an enlarged head} on the threaded rod engaging the outside of the other flanges whereby rotation of the screw in one direction will draw the lock nut and one flange toward the other flange to adjust the flanges toward the sides of {TAIL ~ switches} with smaller widths 
A threaded rod extends through the flanges with a lock nut threaded onto one end and the nut engaged against the outside of one flange , and with { HEAD ~ an enlarged head } on the threaded rod engaging the outside of the other flanges whereby rotation of the screw in one direction will draw the lock nut and one flange toward the other flange to adjust the flanges toward the sides of { TAIL ~ switches } with smaller widths
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 HEAD HEAD HEAD HEAD HEAD HEAD HEAD 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 OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH