[learning]

would love to see photos when you're done. congratulations

[learning]

If a thorough cleaning doesn't help…..I wonder if replacing the extractor or extractor and spring might not be the easies thing to do.

This place has a bunch of extractors and parts for a Sako…perhaps call them and see if they're the same fit as for Tikka

http://pacifictoolandgauge.com/search?controller=search&orderby=position&orderway=desc&search_query=sako+extractor&submit_search=

Brownells also has a bunch of parts:
http://www.brownells.com/rifle-parts/bolt-parts/bolts/parts-spare-for-bolt-tikka-prod30972.aspx?avs%7cMake_3=Tikka