[SoulManic]

Its evident that you don't know much about ships cannons, or siege cannons, side ways movement is referred to as Windage, and was achieved by the use of 6 ft long iron shod levers.
Those eyes may seem too small for your inexperienced point of view but thats what they were used for, for a realistic episode of ships cannons at work I suggest you watch the film Master & Commander, thats as near as the real thing as you will ever get.
As for fire arms and such, I suggest you ring Fulwood Museum & ask for Jane the Curator, then ask her of my knowledge on the subject.
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Thanks for pointing out that I don't know much about ship's or seige cannon (actually I don't know anything at all about them) and that your knowledge of firearms and such can be confirmed by a museum curator (there I was thinking you didn't know your carriage from your trunnion).
Can we stop this silly bickering now.
I think we are pretty clear now that your knowledgeable believe is that the front small eye and its connecting ironwork under the front of the carriage to which the front wheels appear to be attached is simply to haul the cannon forward in a straight line. OK, got it, but still not fully convinced. Now let it drop, but preferably not on my foot.