Need larger screws

我的问题

Weak battery & broken case.

我的修理方法

Fixed one 4S with a new battery and back case. A bit intimidated about fixing the second 4S with a new front screen and battery. 41 steps? Is there a trick to reinserting those microscopic screws? Found out that coffee is not recommended before repair.

我的建议

Make a large workspace. One battery screw popped out and onto the carpet....gone forever. Magnet didn't help.