Most medicine cabinets have 4 screws either in the sides or on the back wall of the cabinet that hold them in place.... unload your cabinet and take the shelves out.... take out the 4 screws and then check around the outside of the cabinet where it contacts the wall to see if it was caulked, if it was then use a SE blade to cut the caulking to separate the cabinet from the wall. Once you have done this you should be able to remove the cabinet from the wall.
Now that the cabinet is removed you can either replace it with one of the old style cabinets with the slot or put a slot in the one you have. Be sure to cut a slot that slants down so the blades will have room to go in.
While you have the cabinet out look into the wall to see if there is any insulation below the cabinet where the blades would fall. if there is then you will need to pull this out... Be sure to check if there are any electrical lines in the wall below the cabinet that might be cut by falling blades.... if there is this is very simple to remedy. get a few of the plastic report covers and drape them over the wires like a tent.
When all that is done simply reverse the cabinet removal procedure to install it and you are done.
Geez, that's a lot of work for the sake of convenience! Wouldn't an Altoids tin/tomato can/blade bank be easier/cheaper/safer?
