I have a 10 kg Rocna that sits securely on the stock MacGregor bow roller on my 26M. I saw Aerwyna install his new Sarca on the bow roller of his 26m. It fits. I believe he was working on a way to easily secure it. My Rocna clips to the bow cleat but the long slot on the Sarca would not work the same as mine. Try messaging Aerwyna using the personal messaging under the membership tab.