Can't unplug distributor harness
 

Hi,

Trying to replace the distributor o-ring, and I can't get past the first hurdle: the wiring harness won't unplug. I'm sure there must be a clip/tab or something, but I can't find it. I inserted a small flathead screwdriver into the notch you can see along the bottom, but still no luck. Any insight?

Attachment 801

An even more basic question: does the black part unclip from the silver part, or does the silver part pull out from the distributor itself?