Hello mate, lol that mesh is WAY too loose!
The best way to get it right (it's quite easy tbh) is to place motor with circular face/mount plate securely attached, into the bottom half of the mount, which is obviously attached to chassis. Place top half of mount on and tighten down until you can just about rotate motor can within the mount. It should line up perfectly, as the face plate and mount clamps are keyed together. Helps if you start off with about the same gap you have in those pics, maybe a tad more. Then either insert a strip of min 90gsm weight paper (as per manual) between pinion and spur and rotate motor (clockwise when looking from pinon end iirc) to tighten the mesh until you can just about rotate the spur- it'll feel tight, but that's what you're looking for. Now tighten down clamps screws securely, BUT NOT TOO TIGHT!- just pinch them tight. Remove paper and you should have a perfect mesh.
Alternatively, just tighten without paper until you just get a little wiggle room (and small click click) when you gently rock the spur back and forth with a finger. There's loads of YT vids showing exactly the wiggle you need.
Remember though, do the fine adjustment with the motor mount/clamp tightened JUST enough to allow the motor to rotate. This helps prevent the mesh changing as you fully tighten down.
Final point/tip: I personally don't use much if any thread lock on mount screws as the tend to seize into the alloy. And certainly don't get any on the mating surfaces of the top and bottom halves of the mount- that messes up to clamping process!
Good luck