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.
![[Credit: Wikimedia Commons]](https://www.kitplanes.com/wp-content/uploads/2026/07/4_rutan_a_longez.jpg_preview.jpg?w=218&h=150&crop=1 "Rutan Symposium Turns to the Coming Canard Maintenance Crisis")
![The week ahead: a KC-135 tanker passes over the grounds at EAA AirVenture Oshkosh, where Phillips 66 will set up at tents #430 and #431. [Credit: USDA Forest Service]](https://www.kitplanes.com/wp-content/uploads/2026/07/Screenshot-2026-07-22-at-10.01.04-AM.jpg?w=218&h=150&crop=1 "Phillips 66 Sets Course for Oshkosh With Specials, Seminars—and Popsicles")
![[Credit: Lisa Turner]](https://www.kitplanes.com/wp-content/uploads/2026/02/Fuel-Selector.jpg?w=218&h=150&crop=1 "Fuel Follies")
In Case You Missed It
Companion DIY Drill Guide
Build a simple aluminum jig to drill AN bolt threads for safety wiring—perfect for when your hardware bin is missing just one critical part.
Archive: May 2014
The Vortex M912 gyroplane was our cover subject a decade ago for the May 2014 issue.
Design Process: Size, Bones, and Balance
Up to now in our ongoing series about the design process, we have been...