5/8" spade drill bit used to drill out bottom curve of notches,
carefully aligned with stringer direction,
usually not at right angles to frames
saber saw used to make upper and lower cuts to complete notches,
usually not at right angles to frames so the saw has to be held freehand and steady
custom notch sander made from sandpaper wrapped over stringer stock,
each notch was sanded to the correct depth,
and for a loose fit on the sides leaving room for epoxy filler
notches complete on the starboard side
a stringer was temporarily fitted dry to each row of notches,
to confirm that notch depths and overall fit was good
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