The only way to use the underside to the piston for balancing is to use a huge drill bit. That way the drilled area will be spread out over a large area and will not effect the depth too much
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Title: Drill Bit Selection for Under Dome Balancing
Description: The only way to use the underside to the piston for balancing is to use a huge drill bit. That way the drilled area will be spread out over a large area and will not effect the depth too much
