The latest Section 37 fuel tank plans update (12/27/13) notes that the blobs of tank sealant (chads) that can form on the rivet shop heads should be removed. Easy enough if you still have access to the interior of the tank, but not so easy otherwise. Has anyone experienced any problems with these bit of sealant becoming detached? The plans revision page talks about `addressing the issue of dangling chads'. What issue?