Try not to actually bend them! Try pulling them apart at the same time (evenly) by grabbing the headband right above the rod blocks and pulling apart a little at a time, so they form into a (U) shape.
I also mentioned in another thread, you can purchase (shaft collars) + (O-rings) to keep the height adjustment of the drivers by sliding the (O-rings) onto the tops of the rods, then sliding the (shaft collars) onto the rods and locking them with the set screw. I use the (O-ring) to protect the plastic rod blocks from the metal (shaft collars).
This works out very well.