The adapator included with our Jotul F3 CB doesn't fit.. Suggestions?

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After removing the knock-out, the rough edges should be filed down with a coarse metal, half-round file or gently with a small grinder until the adapter fits snugly but easily. I used a file to take down the high points on ours and the adapter was fitting in about 15 minutes.
 
If I remember right, some ridge was left, but don't hold me to that. It was several years ago when I did this. Put the adapter inline with the knockout hole and then take a pencil or ink marker and draw a line around the edge of the adapter. That will guide you. The cast iron is fairly soft and filed pretty quickly once I got into it. A grinder or Dremel tool should also work, but don't get too aggressive.
 
Mine took a little work too, not much. Let us know if this works.
 
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