Metal plates that go over the rods of a counterweight arbor that are distributed throughout the stack of counterweights to keep the rods from bending in the event of a the arbor slamming against its top or bottom stop. The top plate, along with the stop collars (locking collars) also serves to hold the counterweights secure in the event of a runaway.
http://www.sapsis-rigging.com/Images/Arbors.gif
http://www.sapsis-rigging.com/Images/Arbors.gif
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