No need to apologize Albus, if a product has issues it's good to know them. I like the Hayden system too and was happy to have more options, but the 1150€ for an instrument is not a cheap start considering that in Italy that's the average range for a month salary in a white collar job, and some people in the service industry makes even less.
I don't want to bother you with details, I'm sure you can imagine them.
Thanks for the tip! there was a mate building his own crane duet and that was amazing. Cheers Albus, good luck on your concertina journey. I'll maybe try to find an used Hayden 46 and see how it goes