well since then i changed most of my screws to titanium ones i had lying about and noticed something rather unusual on the steel screws: the heads are badly marked where it was in contact with the chassis. I just checked on my "old" TRF415 that has steel screws underneath, and the screws are hardly marked at all even after a lot of use.
Looking at a never used hole on both the 415 and the 501, I can see the countersinking is a lot neater on the 415, you can see the layers sticking out on the 501 chassis, so it could just be that the tool was in need of sharpening...
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