You can sand, file or grind ignition points as long as they still have tungsten on them. You can easily see the tungsten and the silver solder that holds it onto the base or arm. I use a die grinder and just dust them off. You need to clean them with contact cleaner if you have some and you can and NEVER touch the tungsten. The oil from your skin will contaminate them.
I had a 8-N and a 9-N and both were converted to 12V. With the 6V starter they always started easy. They sell 12V coils for them, they cost the same as 6V. I had a bad alternator on one and it would run up to two hours on a good 12V battery.
I would love to kick the idiot who put the distributor on the front of the engine! I've had too many cut knuckles from the radiator fins while messing with the ignition.