Crazy newbies! Would you hit upon the idea of puttying your coil? So that it turns into a solid pancake… Do not do this, it’s bad for your metal detector.
Such cover significantly increases the total weight of the coil. Hence this creates additional load on the coil bolt and shaft. And the plastic bolt is the one that will break down first and foremost with such a cover. And in future, you will have a play in the shaft ahead of you.
Want to see one more homemade coil cover from newbies? It’s not as heavy, but herewith as bad to hunt with as this one.