I just got my AquaC Remora off of Ebay (Pls don't flame me

) and it turns out its a 1st Generation, without the Injector Access Screw.
Has anyone added the Injector Access Screw to a 1st-Gen Remora?
Can I drill/tap the pipe and add one? If I can, do I align the hole to the center of the down pipe?
On the newer models, is that how its aligned?