I have just bought one via ebay, and I have found that there is some play on the position of the bars, so that if I press away from me, the chord is correct, and if towards me, it isn't.

I have checked by pressing down each chord and then seeing which strings are open. (I finally had a eureka moment on a course run by Candida Tobin, which taught me how the scales and their chords are related, which theory in school, and piano lessons had left cold.)

Penny