Thanks guys
OK, I was on the right track, but as usual seems they need a little 'persuasion'.
I'll try a different screwdriver and a bit more wiggle

Yes Tom, that is dielectric grease in there, so should not cause a problem....except stopping me from seeing in there properly, hence this question! Thanks for the picture

I'm running my MSD wires through the bulkhead connector so need to remove some redundant wires.