No they don't They have four sheets of fiberglass installed to secure them. I haven't bothered reading the rest of the instructions since I couldn't find the other two but its quite a little process. As soon as I install them I will give you plenty of pics throughout the process. This is all done prior to fiberglassing the wing. I wouldn't want to have to dig them out. I don't think you could without doing a lot of damage to the foam.

On another note, I was beginning to cut out the hinge covers with the included hardwood. You need a 1/32 x 14 inch x 42 inch piece and that only gives you a half inch to spare to make all four wing covers for two flaps (top and bottom) and two ailerons (top and bottom). I have a 1/32 x 12 inch x 40 inch in the kit. I don't know if this was a mistake or its used for something else but I hope this isn't a preview of things to come. They either put in the wrong size or its missing. Off to the hobby shop.

Fred