James,
Yes that's fine if the screw thread is narrow enough for the Aqua-dapter to fit over. As I mentioned they're not all the same, for instance some are solid (can't be drilled theough). Some of them don't actually need drilling though, there's already a hole - which I think Darran mentioned here.
As is mentioned in our FAQs it's really down to preference and getting the best fit to make sure it's secure when you're working.
Paul