Here is how I covered the flap pushrod holes, 10 years ago, to seal against drafts and dirt:
Here is a nifty flap pushrod gap seal that is easily made from the foam of a foam paintbrush. It really does a nice job, is cheap, and durable. It still looks fine after 10 years of service!
The paintbrush foam is soft, yet tough, and conforms nicely around the flap pushrod. The U-shaped piece of aluminum on the bottom was intentionally left rough, not deburred, and drilled full of rough holes so it would grip the foam tightly. That foam is just the ticket.
In the lower right corner you can see a hole which I melted through the foam with a soldering iron. When you install the floorboard, a screw goes through that hole. The foam scrunches down nearly flat, as you can see, and does not cause any fitting problems even though it is between the floorboard and angle on the fuselage.
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Vince Frazier
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