Mini wind-up boat remix: improved spring cover

The spring cover of the original model was way too loose and came off easily (especially when handled by children) so a remix was called for. This remixed part doesn't come off by accident and has been rated child-proof by professional children.

Recommended printing material: PETG

P.S. If you wish to edit this model, the attached Freecad-file will likely only open with the Realthunder Link -branch of Freecad which you can find here. I specificallly used the version 2022.10.21 for creating the file.