Mini starter

Hi all, I'm new to these mini starters, i have two here , yes one to take on long adventures as i don't trust the longevity of these cheap units, my question is about the drain hole in the solenoid side, the one mounted has the hole facing up, and the other has the hole on the bottom side, did they drill the hole in the mounted starter wrong? Wouldn't it just catch the water and other crud, should i block this hole and drill another hole on the bottom side?

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