I have a set of Bottelsen Megathrusts on the way. Here is what I think they are going to look like:
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As you can see, they don't come with standard shafts (although the Dartscorner website has conflicting pictures).

I was wondering if anyone has ever heard of an adapter which would accept standard shafts?

Just slap a set of standard shafts on there and you're good to go.

It's a 2ba thread.

I know some of the Bottelsen are different I think its the GT shafts that have a thin thread.