Nout is right, it's time consuming work.
But the good news is that changing out the crappy "simulated leather" valves for ventile (not natural leather) valves WILL make quite a difference in one of these cheap accordions.

I have done it and it does help.
Other things that help are completely removing the bellows from the accordion and flexing it in ALL directions to it's extremes (like some exercise device) for an hour while watching TV or listening to your favorite album.

The third and final thing to make it play better is to painstakingly adjust the reed gap on each reed to achieve the most sound with the least air. (for the expert repair tech)

Now that you have spent $500 of time trying to put "lipstick on a pig", you might just be better off selling the thing, adding $500 and buying a good used box!

DP

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