They replace almost all the screws except the odd ones that have a very shallow screw head. If I remember correctly, there are the two small ones that mount the spur to the spur holder, and one of the long ones that come from the bottom of the chassis into one of the servo mounts. Oh ya, also the motor mount screws which are cap head steel screws (black). Oh, and the four 2.5mm X (I think) 10mm screws that go in the middle of the gear cover (middle belt cover). These screws are not replaced. There might be others but this is all I remember. Basically, the titanium screw set replaces all the ordinary shaped phillips head M3 (aka 3mm) screws with titanium button head and flat head (aka countersunk) M3 screws, and nothing else. If you find any screws with a fancy head, you use the original one.
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