Do you have a mold for those? Some look a bit oblong, which would cause problems.
Well, that is true. I made a quick mold (5 minutes) from a square one using pliers. I hope my second prototype will be better.
I uploaded some more photos (including the handmade mold) to Flickr: http://m.flickr.com/#/photos/alfem/sets/72157642440963435/
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