7.3 Injector plug damaged?

[DIESELCECIL]

2002 F250 7.3
I have a loose connection on the number 7 cyl where the wire plugs into the injector. I recently had the injectors rebuilt. Ran great for 3 weeks and started missing with no power. Had a injector test ran and found the problem. Even with the wire clip on tight it still misses. Ive tried wrapping the connection with metal wire tightly, ran for a few hours and now im back where i started.

Can anybody give me any tips on repairing the injector or possibly a place i could purchase the plug on the side of the injector without buying an entire injector. Any help is appreciated. Thanks!