The broken cannon stand is used when repairing dwarf multicannons within the Artisans Workshop. It can be picked up from the cannon stand desk in the repair workshop after the cannon base has been repaired.
To complete the activity, the broken stand should be dismantled to remove 3 Broken pipes from the stand, leaving an empty broken cannon stand. The Pipes should then be fixed and reattached to the stand to make a fixed Cannon stand. Repairing each broken pipe gives 3.5 xp.
This item cannot be taken outside of the repair area. It can be re-obtained from Aksel if you have left the area after obtaining it.