I had a quick VK...whats ya point...
And yes I agree with the above, re the sealant only on the half moons, use that orange stuff (name evades me at this moment).
Also when tightening the covers bolts/screws to them in a similar fashion as you would putting a head on, that is night tighten them around in a circle, and fully tighten first go, this will ensure that the mating surfaces are meeting square!!!