Model Tech P-47 Thunderbolt Instructions For Final Assembly page 14

Step 2: Tapping the Wing Mounting Block
IMPORTANT
Although the P-47 includes blind nuts to install in the wing mounting block, we suggest tapping the block with a 5mm tap
as we show. This is much easier than installing the blind nuts and is more accurate. Of course, you can opt to install the
blind nuts if you want to.
After you're done tapping the threads, apply a couple of small drops of thin C/A into the holes and let it soak in.
Allow the C/A to completely cure before proceeding.
The C/A will strengthen the threads and help prevent them from being stripped out.
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Using a 5/32" drill bit, carefully drill two holes into the
wing and through the plywood wing mounting block inside
the fuselage. Locate one hole at each of the two intersecting
marks you drew previously.
IMPORTANT
Drill both holes perpendicular to the surface of the wing.
Remove the wing from the fuselage and set it aside.
Carefully apply several drops of thin C/A into both
holes in the wing mounting block. Allow the C/A to dry
completely before proceeding.
WARNING
Let the C/A dry before proceeding to tap the holes. If you
don't, the C/A will clog the tap and ruin the threads.
After the C/A has fully cured, carefully tap the two holes
using a 5mm tap. Work slowly, being careful not to damage
the new threads you've just cut.