There is a product called Lock Tite. It comes in a tube in the adhesive section of your local hardware/home improvement store. There are two types. One is temporary and the other is permanent. One is called Red and the other Blue. I don't remember which is which so read the package. It works great. I used it for a keychain I have that has a screw on knob to hold the keys and charms on that kept coming loose. That reminds me,,,need to buy a new one. I have to add a new granddaughter charm to my keychain. The last tube got lost in the move. With the temporary one once the nut is put on it will stay where you put it and you will need a pair of pliers to remove it. It will not tighten or loosen so make sure you have the nut tightened to the right pressure by testing the blade before the glue dries. You will have to reapply each time you change the blade. I haven't used the permanent one so I would assume that if used the nut will not be easy to take off for blade change.