If you're okay with hex heads these are the ones McGizmo uses; I have these holding a McG clip on my TinyDC. 4-40 x 3/16 Ti screws.
http://www.lunsfordracing.com/mm5/m...&Product_Code=A4B0187&Category_Code=STDBUTTON
http://www.lunsfordracing.com/mm5/m...&Product_Code=A4B0187&Category_Code=STDBUTTON