hi,
i have a problem with my cremina. the joint between boiler and brew unit/lever unit had a very tiny hole. a goldsmith fixed it. now another very tiny hole appeared.
what is the long term solution for this problem?
kind regards, a.

Depends how big the hole is. Pics? I found loctite 290 the be very useful for some pin holes in a boema machine I restored. You need to heat up the boiler with a flame torch and drop a few drop so it penetrates into the pinhole.
This thread might help.
Using Loctite 290 to seal small cracks and pin holes in boilers

thanks

Check out https://www.youtube.com/watch?v=N8F8H4K8ws4. This is Doug describing pinholes, thread-lock and the fact that most pinholes are actually self sealing.

Chris