This will entail unscrewing the assembly and may require a hacksaw to get the rails off.
Damaged plastic handles have to be cut off using a junior hacksaw, taking care not to damage the tang.
Before take off from England I'd hammered those pins in so tight that it would have taken a hacksaw to get them out.
Technically, if you drop a shackle from above waste height you should put a hacksaw through it.
Cut the rest of the thread away which will require a hacksaw and vise.