It’s been a day and a half and no one’s given away my location to the local psychiatric hospital, so Operation Split Fin is a go! I cut three fore and three aft fins and sanded them to matching size. (Pleased to report I did a more consistent job of cutting them out in the first place this time.)
Then I traced around a fore fin on a piece of 20 lb bond paper, drew in a generous area for the other side,and cut the paper out. I applied glue stick to the paper, then put the leading edge down,rolled the paper over that edge,and flattened from root to trailing edge.