The extractor probably came right out because the coil spring behind it was bound up with dirt & oil taking any tension off of the part.
Good not to loose that extractor,,that's about a $35/40 part last time I looked.
Clean it up as you undoubtedly have making sure the small hole for the spring is clear.
Put the extractor coil spring back into it's hole in the bolt assembly and push it in as far as it'll go.
The extractor itself has a small tab on the lower back end of it. That tab has to slip sideways into the enlarged opening in the slot for the extractor in the bolt.
Then the spring pushes the extractor forward to capture it in position and also provides the pivoting spring action to do it's job.
With the spring in place,,push the extractor against the spring compressing it. At the point where the tab on the extractor lines up with the cut-out in the back end of the slot for the extractor itself,,,push the extractor in (to the left). It'll snap a bit forward under spring pressure and have the spring centered behind it at that point.
All ready to go.
Here's a 1917 Savage pistol owners manual. About the same as the 1907. Pretty detailed instructions for complete take apart and re=assembly.
Can be sometimes frustrating to work on as they are closely fitted and the design is not common or familiar. Lot's of odd lookin' stuff in there!
Savage Pocket Automatic Model 1907 - Specifications
Don't force anything!, they come apart and go right back together w/o any help from pliers or hammer if everything is in the correct place.
Some parts are quite fragile and can be very costly to replace.
Very nice pistols from the Great Pocket Pistol Era.
