I'm hoping that you have a similar arrangement to my MD, in that you already have a grub screw there to hold it all together, as worst case scenario, you'll drill the grub screw, (or buy a pre-drilled one from a bolt and nut supplier), unless it's simply clogged with manufacturing swarf, and a lil' poke with a small jewelers screwdriver is all that is required to release the blockage and allow it to breathe
Aaand it won't work. The fill hole has a wall and it sinks through the airflow chamber to the tank. If I drill, I'll drill straight into the airflow chamber. Not gonna do that.
