Why won't the screen latch perform correctly?

I have repaired this metal frame successfully, but it is hard work, and I had to carefully weigh Time v Cost. Cost won, so I bought a new one from this very site. HOWEVER, when there were no time or cost constraints, and simply to DO it, I attempted the repair... J B Weld.....ummmm NO (I cleaned the metal with MEK, let it flash to air, waited the 5 minutes for the JB to be mixed. 24 hours later, I had made a mold (impression), but I did not repair this satisfactorily. SuperGlue (3 kinds, all aircraft/model formulations) none worked. The only thing that actually put the metal frame back together firmly enough to support my battery (hanging) test was welding. I used a flea market aluminum "welding" rod with the "flux" they included with the kit... cleaned it with a stainless wire brush (theirs') and heated the weighted and positioned ends so I could "scrub"...

http://pinouts.ru/PortableDevices/ipod_p... gives pins and corresponding voltages on connector...