Forster upright with negative crown

[Jean-Jacques GRANAS]

Hi Gregor,

Thanks for answering my post. I'm afraid, however, that I don't quite 
understand the screw and coin trick you're writing about. Sounds exotic to 
me. It seems to me that anything pushing the board forward from the back 
would also prevent it from vibrating freely. 

I realize that the only permanent fix would be to replace the board or 
reglue it with new ribs, but, as I wrote, the instrument is not worth the 
expense or the time. That's why I would be interested in suggestiions that 
could improve its sound somewhat, if that's possible.

Cheers,

Jean-Jacques Granas
Warsaw, Poland