You probably use knives around the house for a variety of reasons. Maybe you have a favourite knife that allows you to do most jobs. Through the continual use of that knife, you've probably noticed that the blade is getting quite loose. While it may be a good idea to throw away that knife and get a new one for safety reasons, you can repair it with the right materials.
Put on your waterproof, disposable gloves.
Set the blade in the position you'd like it to be in and hold it in your non dominant hand.
Apply epoxy to the area where the blade enters the shaft of the knife with your dominant hand, using a Popsicle stick. This area is different for each knife. In some shafts you can see a space halfway up the shaft where the blade has gone in. If you see this space, apply the epoxy there. If you can only see the blade enter at the bottom of the shaft, apply the epoxy around the bottom of the shaft where the blade touches it.
Set the knife down very carefully, trying hard not to move the position of the blade. Allow the epoxy to set. For most epoxy products, this will only take about five minutes.