I wish I could help but I never had to use part C14 as many have stated the need to do so. I ran my test without it and it was fine. I did MANY runs back and forth in the beginning steps and added more wax in between runs. I hope that maybe more wax helps. I do sand and wax between every cog and I even waxed my plastic cogs as well. Welcome to the group. Here is mine.👍 [ROKR DIY & Creativity] Completion of my custom Space Shuttle - #63 by Nita_Davis
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