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We'll be replacing the original rear wing attach plate (6B5-4) with a heavy-duty 1/8-inch 6-ZU-3-5 Attach Plate. This is the plate that sticks out the sides of the center fuselage and that bolts to the wing's rear channel. Note that the CH 650 model already uses a 1/8-inch rear (65B5-4), so this only applies to the CH 601 XL model.
Reaching behind the seat back we drill out the original attach plates. After having drilled out the plate (6B5-4), we clamp it to the new thicker plate (same dimensions) and back drill into the new attach plate 6-ZU-3-5. We do this for the plates on both sides...
The new heavy-duty 1/8-inch 6-ZU-3-5 Attach Plate next to the original 6B5-4 plate:
Reaching behind the seat area, we have access to cleco the new plate into position before riveting it back in.
We push the left (pilot's) side Attach Plate into position to cleco and rivet it:
The new Attach Plate 6-ZU-3-5 riveted in place (viewed from the outside, right side of fuselage):