Need Help Repairing Gundam Fix Guncannon right arm

the gundam fix toys are both toys and models at the same time, but my problem is that while swapping out the RX-77-2 armor for the RX-77B mass production armor the right arms shoulder just snapped....and this was applying the regular force to get the arm armor off its arm, is there anyone that can suggest a fix for this, or will my guncannon forever join the ranks of the battle damage gundam series