This is how you make a mini tnt cannon
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Step 1: The Frame
Build a u shape and then add a slab at the top
Step 2: The Water
And the water at the bottom of the u
Step 3: Redstone
Put the button at the bottom of the u and do the outside of the u with Redstone and then Add repeaters one block before the top block
Step 4: Tnt
Put tnt on the slab and the block next to it in the water flow
Step 5: BOOM!!!
The tnt should go flying and blow up