Weltaflex stuck?

Hi there,

I just bought a Weltaflex (well, two actually, it was a sort of two for the price of one deal) and it seemed to work fine when i received it. However, somehow I got it stuck, the shutter won't fire. This weltaflex is the version with a counter which should reset when the backcover is opened, this doesn't happen though. This let me to believe that the counter is the problem. Any idea how I could get it going again?

Any suggestions will be very welcome,

thanks,

Alfred