Mags
The easy answer is the shower of sparks takes place of the impulse coupler so you don't need the impulse.
One of the mags needs to have two terminals, one is for the normal on/off switch, which is grounded out during the start. The other terminal is for the shower of sparks used only during the start. Maybe take a pic of both mags? Need to see the rear of the mag. How was the engine/mags set up originally?
If you can look inside of each mag, you should see one with two sets of points, hopefully, if not?
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