Primer lines need to be silver soldered into their fittings. Using RTV to fix a leak is not acceptable and poses a serious fire hazard.
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The Home Machinist
Using a real computer-assisted design (CAD) program to design your panel has multiple benefits.
Build Your Skills: Composites (Part 10)
What do you do when your horizontal stabilizer isn't exactly horizontal? First, you check that the fuselage is level. If this confirms that the stabilizer is indeed slightly off, remove it and apply heat. Sounds simple, but there's a right and a wrong way to go about it, and author Bob Fritz describes the most effective method to straighten things out.