Finally after a month waiting I received my USA imported Timing Belt so time to finish the assambling. But here comes a horror story, installing the cam plastic cover one of the screws from this cover FELL INSIDE THE ENGINE HEAD into what it looks like a oil drain hole in the middle ( the screw is like 25mm long by 4 mm width). I tried to grab it with a magnet tip etc. but it seems to be beyond reach. Will it end up in the oil baffle or sticked in the walls? Do I need to remove the head again? Should I just leave it there, could it damage the crank? I am literaly screw up !! Need advice thanks !!