Another point:

I use a handheld glo plug starter because I start my planes from behind pushing the plane onto a mounted starter. I secure the field box against the work table, and as I push the prop nut against the mounted starter moter, it slides back and trips a micro switch which spins the prop. Meanwhile my hands are completely behind the plane. Wires to a glo connector would be impossible. It was a device manufactured years ago and I bought one and have used it since. I believe there are other makers but I don't know where and I believe there are plans for making the same type of device. Whatever I am always behind the aircraft which reduces the tendency to reach over the prop (very dangerous) to adjust the needle valve.

Roodester