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Well the screw has a flat head (the part in contact with the ring) so any screw with the correct length and size will do.
I played a bit with it, to change from positions 1 to 5, but ended in the middle position from about km 600 and never looked back. Maybe I'll try to play again with it this autumn
bertocq
I've always been put off from buying doval chainrings by the sheer concept of having a philips head screw anywhere on my bike
can that screw be replaced by a torx just for the sake of it?