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Reporting success on fixing the broken tab for my mp-43 megatron ko. Ultimately the black ABS cement from home depot was not strong enough by itself, but it did properly weld. I ended up reinforcing it with a shim of 30 mil polystyrene which I pinned in place with two staples. Everything is held together with super glue because I didnt want to wait another 24 hours for the ABS to cure again, but I think the proper way to fix this would have been to use both glues.
I did have to carve out a little extra room on the receiving side for the shim to fit, but that was easy. It holds together nice and tight now. Im just waiting for the putty to dry on two holes in the mold (one on the dino head lower jaw and one on the shoulder pointy thing where the plastic was either thin or didnt reach while molding.