Patching a barrel is close to the technical limit of my gun maintenance skills and knowledge. So taking a bolt apart for a clean and oil is a big step for me to take.
Owning a rifle from a manufacturer who is now out of business can have its challenges, particularly when it comes to solving straightforward issues. But never mind, SD came to the rescue. And specifically 8x57 who very kindly sent me his spare bolt tool from a previous Varberger. Thank you sir
So for posterity, I thought I'd add the sum of my new knowledge to SD in case any future owner has the same issue.
first you need to decock the bolt, the bolt tool on the right is perfect.
Decock by turning the cocking lever towards the bolt handle.
Decocking the bolt releases the tension on the firing pin mechanism that is retaining the bolt handle. Pull on the bolt handle firmly at 90 degrees to bolt to remove.
The bolt internals can now be easily removed.
Assembly is the reverse.
Made like a Swedish vault!
Hope this helps some one out in future.