Spot on...Originally posted by QuackingPlums
I didn't see the first post so I don't know what marker you're talking about, but my guess is it's an Impy or a Shocker, in which case the holes are drilled all the way thru from the outside via the side chambers, into the main chamber. The outside holes are then filled and loctited with small grub screws that you should NEVER need to remove. This is the only way to get a passage for air between two tubes inside your body, see?