Great Planes PT-40 MkII Kit - GPMA0118 - Manual (Page 13)

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3. Use the same procedure to mark the centerline on the
entire length of the leading edge of the elevator.
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4. Cut the hinge slots in the elevator and stabilizer using
a #11 blade. Begin by carefully cutting a very shallow slit
at the hinge location. This first cut will establish the
location of the hinge slot, so concentrate on staying on the
centerline and don’t cut too deep!
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5. Make three or four more cuts on the same line, going
slightly deeper each time. As you make these additional
cuts, go straight into the wood. Continue this process while
“wiggling” the knife handle from side to side until the
blade has reached the proper depth for the hinge.
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6. Refer to the Expert Tip below and sand the LE of the
elevator and rudder to a “V” as shown on the plans. Leave
the TE of the stab and fin squared off.
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B. Confirm that the line you have drawn is on center by
flipping the part over and drawing a second line over the
first. If the line is on center, you will see only one line.
Draw a centerline at each hinge location. If you see two
lines (as in the photo) go to step C.
HOW TO BEVEL THE LEADING EDGES
A. Place the leading edge of the elevator on your work
surface and use your ballpoint pen to mark a “bevel to”
line on both sides about 3/32" high. Note: You will
probably have to shim the elevator (similar to the way
you did for drawing the hinging centerlines) so your bevel
to line is not too far away from the leading edge.
C. Place shims such as business cards or playing cards
under the stab until you can mark the centerline.
CUT HINGE SLOT
WITH HOBBY KNIFE
AND #11 BLADE