Question Looking for delrin thumbwheels, but do I need Metric or Imperial threads?

[Heruhur]

So I have a Halcyon Infinity 40 BP/W (with the weighted STA) and I'm getting sick of tightening the wing nuts every time and ending up with a wobbly STA nonetheless.
So I'm looking to get some delrin thumb wheels, but which do I need? Imperial or Metric?
The wing was bought here in Europe, anyone know if Halcyon goes metric for European customers?

 

[Divin'Papaw]

BTW delrin thumbwheels are da bomb! I've been using them for over a decade on doubles and single STAs. I wouldn't use anything else. They stay nice and tight with very little loosening and being one piece is very convenient. Easy to use with wet or gloved hands as well.