This model was inspired by a 32-pounder carronade of the sloop “Helena” in 1804. 

Additionally you'll need:

• For the axis: A thin piece of metall eg from a paperclip 
• For the angle adjustment: A M3 screw (I used 25 mm)

Then you can put everything together. I added some super glue under the handle so you can actually use it to adjust the angle.