Velhon oppipoika

I saw this movie on a children's program on Dutch TV when I was on basic school, I cannot remember if it was before or after 1980. What I do remember is the impact it made on me : an atmosphere that could be called "Gothic" in the Romantic sense of the word, I still cannot believe this was broadcast on TV for youths when I especially recall the hand-shaking ceremony of the master wizard, by this magically taking the new apprentice of the mill as his magical disciple. I did not know much about the Satan's pact of the popular witchcraft stories, but GOSH, that moment was creepy to the bone!!!! The exclamation of the master wizard when the young apprentice is taken into the magical brotherhood of the other young disciples "Now the mill grinds again!!" is forever engraved in my mind!! If anyone knows where this masterpiece is distributed, send me word...