Image flip problem on concrete artilleries

[Stratego (dev)]

here are the images, the problem with them that they are
a) not in middle of image - so flipping it makes it move a little
b) the sun-reflection is not in middle - so flipping it makes a weird effect that the sun shines from different directions - we needto put that part into the middle - so flipping will not move it.
c) also shades are similarly weird as moving from right to left and back, so we need a totally symmetric appearance on middle vertical pixel column

can someone help making it on all images?