Thanks to all of you!
I believe it's a 10-24, so I've ordered a set of taps.
And interesting what you write Wildey, that you can force the screw in just by drilling a hole in the soft aluminum. Sadly, thers already a stainless screw stuck in there, but otherwize I would have tried. And the...
Okay, so while installing a new grounding/continuity circuit kit, two bolts/screws on my Mercruiser Alpha one Gen 2.
And, since we use metric threads in Sweden, I couldn't use my normal pipe tap-kit.
Do anyone here know what thread size, or pipe tap size I should use for those small torx...
Thanks! But, where do I find a good site for that? The ones I've tried only shoes writings of transom parts... Can't find a picture of the exhaust part, where the flapper is located...