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Bad Sony XAV-9500ES Screws

I have a Sony XAV-9500ES unit in my aging car. It's mostly great, adding much needed Android Auto support. My main complaint is that it tends to rattle over time as the screws self-loosen from normal vibrations - requiring continuous tightening.

My plan is to thread-lock them, but while I'm at that, I'm replacing them with Torx as they are completely stripped at this point (soft metal).

Two black screws
These were so hard to photograph.

The one on the left is a M4 x 5mm PH3, pan-head (maybe 6mm, length doesn't matter that much). The right one is a M4 x 6mm PH3, flat-head, 45 degrees.