Buccaneer,
Attached are some pictures of some jump spark ignition timers. Using a buzz coil spark occurs when the circuit is closed via points or wiper. The first pick shows an early Lockwood that has a spring loaded plunger that contacts a brass contact placed in the insulated ring. The next two is a later Lockwood converted to modern points. Last is a Ferro that the cam lobe simply swipes against a piece of spring steel which is insulated from the timer housing. Castings for the Lockwood handle and plunger are available as well as the covers. I use micarta for the insulating ring and cam lobe for these timers. A simple one piece housing can quickly be turned on a lathe with a suitable sized round of aluminum and handle added. A mount could be fabricated from some .5 – .750 aluminum plate. A short drive shaft, with a set collar on the engine side of the mount. A wiper or point set up with a insulated contact, buzz coil, cover and mount and your good to go. I hope this makes since. My shop is across town and no internet there, if needed I can go take some timers apart for more pics if needed. Will post some buzz coil info in a little bit.
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