Switch to your spade and open the chest with it. Walk over it and it should appear in your tool bar. Now there shold be another item on the floor, thats the glitched item. The one in your inventory is the original item. The item you should keep popping in and out. Take the item you want to duplicate, and hold down A when its in the FUEL box. When its about 90% broken, (still holding the mine trigger), switch to your spade. Now start breaking the furnace with your pick axe. The only things you should have in your tool bar are the pick axe and spade. Next, place the item you want to duplicate into the top middle of your inventory.

Start by taking every thing out of your inventory, except the four items. This is a simple cheat to do, though it may take a while. After you got the stack of sixty four press and hold down the x button in a empty slot, the sixty four will go down but then when your one sixty four pack runs down to zero from placing them your sixty four will repeat and then you will have two sixty four packs. Go back into the dispenser menu (before the TNT explodes) and the object will change to sixty four (click it fast though) the item will duplicate even if its something you can't stack up the number, like a diamond sword for example you can't have two separate diamond swords and put them together to make a bundle of two but with this glitch you can.

Then quit out of the dispenser menu with your object still inside, then hit the TNT (you will take damage so try to have gear on). Go inside the dispenser menu and place it in the middle what ever you want to duplicate. Place the dispenser outside and right next to some TNT. After that, you need to start killing some creeps because you need some TNT.

First, you need to have a dispenser which you can make from a workbench.

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