announcement due, page-18

Tightjock, you can clearly see the tubes.
The tube fits in the hole so you can ROUGHLY work out the size of the hole just from looking at that picture.

To me, looking on my iPhone it looks about 100mm or 4".
Like I said, roughly.

As today is a public holiday in WA our office is closed but tomorrow I'll call and find out what size of drill and tubes we are using at Bogdan.

It's not a secret so I'm sure I'll get a correct answer.