WO GT81 IV mountng

[woodypower]

Hi

I have ordered a WO GT81 iv and will use it with my NEQ6. In order to improve balancing, I would like to remove the original dovetail, and attach the scope to the WO 400mm Losmandy type D.  (link below)

https://williamoptics.com/products/accessories/mounting/losmandy-style-type-d-swan-series

I know there are three holes on the underside of the mounting rings, and I would like to use all 3, but what thread are they and what’s the distance between them?

Many thanks