Injectors: Damaged?

Ok, so i got the injectors from Dave, and before i started, 2 of them had cracks on the red tips (They are 370cc SR sidefeeds). I assume these 2 are destoryed and cant be repaired (can they?)…

Also in the removal of one of these i slipped on the pliers and took out the think circle wall at the top of the injector (it surrounds the brass metal pin at the top) i assume i damaged this one beyond all repair or will it be able to work?

Also is there a easier way to these sidefeeds out? they are stuck in tight…

twist then pull.

A little gas never hurt too.