Need replacement screws for 640 XL

[CaptainLumia]

Anyone know the exact specifications or where to buy replacement screws/bolts for this phone? I tried to fix my screen last night and stripped a few pretty badly. I need the 10 that hold the main chasis together and the three interior that hold the main board to the display.

 

[CaptainLumia]

The screen repair didn't go so hot. The actual work itself was easy, more so than I expected. I was able to tear down the phone and swap out the frame assembly with ease. The problem is that when I turned the phone on, the touch feature of the screen works sometimes and sometimes not. I think there's a poor connection because the frame assembly had one tiny black clip (out of two total) next to the SIM cards that was broken. I figured once I got everything screwed back together, it would hold well enough. Apparently not. I superglued the broken clip back in this morning and will attempt to repair again later. However, I seem to be stripping the screws at an alarming rate.

 

[Derausgewanderte]

thanks for the info. not sure how I can help with the screws. I'd try the ones from a Lumia 520 that are available on Amazon. Another user on Amazon says they work on a L820 too.
http://www.amazon.com/BisLinks®-Pie...ag=hawk-future-20&ascsubtag=UUwpUvbUpU3247436