as i'm new to this forum this may be an old idea. i tripod mount my golf ball gun. i mount a torch lighter (squeeze type sparker) inside the chamber of my gun drilling a tiny hole for the pull wire. this allows me to stand to the side. i use acetylene gas for propellant! BIG BANG!
one end cap ...

Those are not project boxes in the pics.
Both are battery igniters, that one takes AA bat.
The button unscrews to get at bat.
Top pic is 4 post, the user is only using 3 posts with one common ground.
It costs approx. 30 $
I've got one on my bench. www.ApplianceFactoryParts.com has them.
I ...