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Same. I couldn't find anything from Sako.
There is a Sako Collectors web site which may have informal info.

I've used:
One piece mounts, threads lightly oiled and wiped dry.
Ring screws x8 T10...

No problems. The tapered dovetail is a rock.

Here it is on the one piece "Ringmount" version:

193257



Here is an older model. showing the two piece system. The hex screw holds the rings...