Watching them make chocolates in Belgium earlier this year they just tap them firmly on a very hard surface and they fall out. Their method for making filled chocolates was to fill the mould with liquid chocolate, allow to cool for 5 minutes then pour off the excess to leave a shell, scrape the top of the mould to leave it flat. Pipe the filling, again leave for 5 mins, top off the mould with liquid chocolate, either by pouring or spooning, wait 5 mins again, scrape the surface with the palette knife to flatten the base of the chocolates, invert the mould and tap out. Very nice :-)