Here is what I would do...

Get 4 pieces of 1/8" plywood about 1" square

Place two on top and bottom of each elevator where the joiner is embedded.

Clamp each set in place with clamps or two vise-grips.

Holding by the clamps, twist to straighten the elevators.

Now, drill a tiny hole in each elevator (hide the hole on the bottom) and add THIN CA to the holes to strengthen any damaged wood