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If evident signs of moisture are found on the discs, place the discs in an oven at a constant temperature of
120 to 150°C for 2 hours.
DO NOT use a drill to remove stubborn
material from the holes.
DO NOT countersink the holes.
DO NOT grind the discs.
DO NOT widen the holes with a drill.
Remove any material from the cross-drilled
ventilation holes in the disc with a metal pin or
a screwdriver no larger than 5 mm in
diameter.
Blow compressed air into the ventilation holes.
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