a hole, washer and nut? Sounds pretty hard to me.
Then of course you can do the typical wrap of tape around the capacitor, then attach a clamp, that of couse has a nut on one side that can fall off, then screw all that nonsense into the chassis with 2 to 3 more screws. If you're really awesome, one foot of the capacitor clamps gets riveted into the chassis to save time and keep screws and nuts from falling into the device.