A little late to the party on this post, but I thought I would share some info that I got from Shirogorov regarding spa treatment:
Yes, you can send in your knife for a touch up. The price would depend on what exactly needs to be done to it (hard to tell without one of our specialists taking a look at the actual knife). The detent can be looked at, as well.
For sending your knife in to us, please use the following address:
Recipient: Nasyrov Nikita Nakypovich
Street: Ul. Sverdlova, 87/12-23
City: Yaroslavl
Country: Russia
Zip code: 150054
Please include a paper in the package with the exact description of the problem, your full return address (including zip code and country), and what would you like us to write on the return shipment form (item name and declared value).
Note that the shipping risk is entirely on the original sender, unfortunately, should anything happen to the knife in transit (getting damaged or misplaced), the Shirogorov workshop cannot be held liable.
Out of personal experience, knives getting lost does not happen often, but it does happen sometimes. Out of ca. 20 or so knives that I have both sent and received to/from the US all have gotten through. But I do know of knife collectors that have had knives disappear in transit (though we are talking about guys with hundreds of knives in their collections). Regarding customs forms it's entirely up to the sender to decide on which value to declare and what to write in the field 'item declaration'. If you write 'knife', chances are, the item will get impounded for a month by the Russian customs, then sent back to the original sender (i.e. back to you). As officially, you are not allowed to send knives to Russia (but you can buy them freely in any knife, hunting, tactical or general convenience store...go figure). I personally used to write 'camping tool' and declare some small value of USD 90, or USD 120 (even for customs which cost 1k), to keep it 'under the radar'. When packaging the knife, I made sure I didn't pack it into anything flashy which would draw attention, made sure the knife box was covered and couldn't be seen from the outside (just wrapped an A4 sheet around the Shiro box), used bubble wrap, and copious amounts of tape (when you think you have too much, add some more). The idea is that a package that does not look especially pretty, is taped over 3 times so that opening it without anyone noticing will be impossible, and that has a lower-ish declared value is a lot less likely to draw attention than a non-taped box which says 'iPhone 6' on it. But that is my personal experience, how you decide to proceed is entirely up to you. I just shared the way that worked for me, there may be others, just as efficient.
Regards,
Tom
Shirogorov knives team