Hi, this is my first time posting and I'm new here.  Thanks in advance for any help/ advice you can give me.

I have a Fender Reverb amp head- used- and the jack needs replaced.  I first thought this as the guitar lead doesn't click into place. It seems from opening the head up that the jack is missing one or two grips to keep the lead in place.  If you push the lead to the side, the amp makes a hideous sharp piercing noise and crackles (not feedback),

The jack is connected to the circuit board not by a wire; sort of small  metal dots poking through the circuit board. 

Would this be a pain to do myself? 

Any advice on what to do would be welcomed.  I've attached a picture. 

Cheers guys.