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Thanks again Larry,
Sorry about the confusion on screw heads. What I meant, and hope the photo shows, is a head with a flat wide bottom: a button or a truss head perhaps, locally also marketed as furniture screws.
I will go for a new shooting board with acetal plastic sole and side rail. I can easily get the tape you mentioned (thanks for the suggestion) and will use it. The side rail is to be adjustable, and hopefully 6 screws will hold it secured. I’m afraid I’m stuck with the m6 x1, but I have those at sufficient length to screw them into both the acetal sole and the underlying form plywood.