Slick released SB-15A, updated on 12-Nov-18. It effectively states that some K3008 distributor gears were improperly manufactured. Gears with a copper electrode have to replaced with gears with Monel electrodes.
Turns out that the plastic didn't properly form around those electrodes. You can see that difference in the image below from one of my mags. The plastic is clearly less encompassing on the copper electrode. This poor plastic formation can cause the electrode to come loose.
The process to remove the mags, pull the gears, reset the E-gap and reinstall the mags was maybe 4 hours. Most of that time was me trying to line up the mag timing and screw the P-lead wire back on the upside-down right mag.
Here's a pic of the the distributor block from one of my mags. I was surprised to see the electrode posts in that condition. It's normal, however.
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