Need help with the Rochester 2G center carb on the tri-power setup on my 32 coupe.

For some reason that is beyond me, it pulls the metal rod out of the plastic body of the accelerator pump assembly. It then jams the pump in the carb housing so that there is only about half throttle left on the center carb.

Has anyone experienced this before? It's the correct accelerator pump assembly according to NAPA and will work for about a week before it goes south.

Appreciate any ideas or help!

Mick