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How can you give yourself that margin of safety that you hope you'll never need?

As homebuilders, we are accustomed to doing a lot of preliminary and/or tooling work to build a couple of pieces for our aircraft. Tom Kuffel created an auxiliary fuel transfer pump controller for his GlaStar Sportsman for next to nothing, a real savings over the retail price of $300, and he describes how he did it.

Interference.

Getting the spark back. By David Boeshaar.