Obviously you have resources available to straighten the record or links to it. How about showing it.
I'm passing on what I've heard for the last 55 years (I was 15 when the guy told me to, "look for the 'clip'. Those are the nicer ones called Riihimaki". ) That was at a gunshow in 1961 and there were several there. When I became the gunsmith in 1969 we almost always had a couple in the used rack, they were on the books as Riihimaki, xxx caliber. If they were marked differently, they were listed by model number. I bought a heavy barrel .222 in 1970 that I still miss terribly. I've got four rifles or foundations of other rifles now.
I would LOVE to know the sequence of changes seen in these rifles. When did the trigger guards go from stamped to forged? When were the white line spacers added to the stocks, when the change in comb flutes? WHERE can I find a 22 Hornet to fit the magazine I've had for 40 years?! What calibers were they made in? A really odd 25-20 just changed hands in Florida that I'd never heard of.
How rare are small, 222 size solid bottom single shot actions?
There was a guy for Sako that used to come to Twin Falls, ID every spring to shoot rodents...'Ari' is the only name I know. He brought eight of those cute actions in about 1994 but all were spoken for and he couldn't get me another one. I'd give a finger to find one.....
Always feel free to correct me when I get something wrong. That's the way I learn.
A currently made and used Sako extractor is a 'lever driven by a coil spring'. The early ones are a leaf spring shaped with an extractor hook and stop surface that is held in by linear dovetail. The early part is ONE part. The current extractor is three parts. They're cheaper that way.
I'll pass on the used one for sale. My home-made model is working but weak and not reliable. BUT, I have four Riihimaki 'variations' of Sako rifles that can interchange bolts without a problem. The rebarreled .221 Fireball and the two re-barreled 6mm Cheapshots have exactly the same bolt to chamber dimensions as the original .222 Rem sporter. The Fireball broke the extractor at just over 3300 rounds. I went to 3500 and set the barrel back and made an extractor that's still in it and still shooting, but not the 1500 rounds a season it did for several years. Not long ago, I put three rounds into .360". That was the first paper that gun has shot since 1988 when it did the same thing in load development. Re7-- the forgotten small case powder, in my opinion.