Locate in advance a recommended metalsmith school and set up a
meeting with both admin and a professor in Latvia. Ask the school to
send a letter that you will be visiting the school for educational
purposes. Take your tools to the airport in advance and let a
supervisor examine them and tell you if any will be unacceptable on
a flight. On the flight take your tools carry-on, not checked
luggage, and be willing to let them be examined by pre-flight
security. You may be asked to hand them over to the cockpit if
requested during the flight and retrieve them when the flight lands.
In a previous corporate life I worked for a major airline and this is
one of the ways for safely transporting tools. Letters of
introduction are extremely helpful.
You an also ask the airlines for trusted air mail services, maybe
even Fedex, and mail tools in advance.
You also can call the U. S. embassy in Latvia and ask for best
Tools are a major target of theft in airline travel.
I would leave my best tools home. A good school in Eastern Europe
would be willing to help you make new tools.
Good luck. MA