You shouldn't. That oily substance is lubricant, which is crucial for smooth functionality.
It would be nice if you could color-code the screw “map” so we know which length goes in what post. That way, we don’t ruin a post or strip the head of a screw by trying to fit a 10mm screw into an 8mm post and vice versa. You also might want to add that there is one screw that's well over 10mm long.
You have to remove ALL the screws in order to take the blaster apart. That means on both the priming handle and the blaster itself.
It would be nice if you could color-code where to put the 16mm, 10mm and 8mm screws. That way, you don’t wind up damaging the screw post or stripping a screw by trying to insert a 10mm screw into a post meant for an 8mm one.