Dating armstrong flutes
You could buy a bad flute for 0, put 0 more work into it, and still only be able to resell it four months later for 0, if it's a lemon.
And since you've indicated that you're looking for lessons too, if you're buying a new flute, I would also have your private teacher help play-test a variety of student flutes (new or used) to find the "winner" from among many different flutes.
Never get your old flute fixed or oiled, and then think every new flute you try is better than yours is. a) your old flute becomes mechanically worn out over ten years due to lack of oil, resulting in mechanical "play" that cannot be truly fixed.
b) your finger technique becomes slow and laboured making you think that you're not a very good flute player; or your embouchure technique becomes tight and strained, making you think that your tone is less controllable (really caused by mechanical repair needs ie: cork leaking, pads leaking.) c) you constantly buy new flutes every few years and then allow them to degrade quickly, leaving you back at square one again.2.
If this is the case, go to a bigger store in a bigger city, and call ahead and arrange for multiple "identical" flutes to be there to test-play.
If the store cannot do that for you, deal with a flute specialist ( your local flute-only dealers).3.
Most flute students sell their old, maintained, flutes at a fairly reasonable price (compared to the markup on used flutes in music stores.) Or: look for a repair-person who sells used instruments; they're likely to have a Yamaha 200 lying around or about to appear on their shelves.
Staccato for how the flute rings during silences Air accents for how rich the tone by using with abdominal breath-pulses and various speeds of vibrato, and accent types.
Check the cork placement with a reliable measuring device (17.3 or 17.5 mm.
Buy a used flute from someone who doesn't play at a pro-level, but mistakenly paid alot of money for a worn out or lemon flute. a) the lemon flute (even if it's gold and really expensive) keeps being sold from amateur to amateur, even though it has had major problems since the day it was made.
b) the used flute may be in a poor state of repair and difficult to play test on short notice so you keep hoping that after repair it will play better (but to what degree you can only guess) c) you end up trying to sell the lemon flute to an unsuspecting next victim (which feels bad if you know its a lemon but are trying to get your money back out of it.)4. Result: a) you could end up with a ,000 flute that plays worse than a 00 one.