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I don't see any problem here at all. The three guns are NOT linked together, in firing nor convergence. Although technically, all 3 guns are cannons, the two 23mm's are controlled by your Weapon 1 command. The 37mm is controlled by your Weapon 2 command.

So, you can apply the convergence for the 23mm's using the 'Machine Guns' setting. The convergence for the 37mm is applied using the 'Cannons' setting.

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