44 to a tip plate 54 which defines a radially outer boundary of an internal cooling chamber 56 cooling chamber 56 is defined within airfoil 42 between sidewalls 45 and 46 in the exemplary embodiment cooling chamber 56 includes a serpentine passage comprising a first cavity 58 a second cavity 60 and a third cavity 62 cooled with compressor bleed air an inlet passage 64 is configured to channel air into first cavity 58 and then into second cavity 60 a refresher hole 66 couples second cavity 60 to the compressor bleed air refresher hole 66 is formed using an electrical discharge machining edm process that generates stress concentration at the sharp edge surrounding the openings of refresher hole 66 and generates recast layer micro cracks associated with the edm process a downstream end of third cavity 62 is in flow communication with a plurality of trailing edge holes 70 which extend longitudinally axially along trailing edge 50 particularly trailing edge holes 70 extend along pressure side wall 46 to trailing edge 50 in operation cooling air is supplied to blade 40 from compressor bleed air through inlet 64 and refresher hole 66 air entering blade 40 through inlet 64 is directed through first cavity 58 and into second cavity 60 refresher hole 66 permits cooler compressor bleed air to enter chamber 56 between second cavity 60 and third cavity 62 the cooler air reduces the temperature and increases the pressure of the air entering third cavity 62 the cooler air and increased pressure facilitate cooling trailing edge 50 through holes 70 air entering first cavity 58 is metered using a meter plate 68 which includes a hole 69 of a predetermined size the flow and pressure in first cavity 58 is adjusted by grinding metering plate 68.