Abstract: In an axial flow turbo-machine such as a gas turbine engine, a foil cap for hollow blades or cantilevered vanes, aft of the combustion chamber thereof is provided, the cap having cooling apertures therethrough which diverge from inside to outside thereof, the improvement being, placing at least some of such cooling apertures to intersect with the junction of end and side surfaces of such cap, to scallop same, so that such cooling apertures cannot be blocked by contact of such cap with a clearance control body in such engine. The so-positioned junction-intersecting, cooling apertures, intersect the foil cap surfaces at an angle and lay down a cooling air film on the end and side surfaces of such cap, even when the cap is contacted with the clearance control body, to maintain a cooling film shield thereon against high temperature engine combustion gases and to reduce the oxidation and erosion of such foil cap that would otherwise occur.