Sophocleese, thanks,

the easy way out would be to claim a typo, but it was a genuine mistake. I was about to say that I just wrongly assumed the German spelling would be valid in English as well (it often is in these words, except for these k/c things) when I remembered to check the German spelling first. I have spelled that word wrong since several decades.

So obviously the advice, spell it as in German and replace k by c and adapt the ending, is still valid but only helpful if you know the German spelling.

Wolfgang