Al,
Sorry about the mis-information
You can use the centres of the M4 inserts to align your masking tape/ template - this will ensure the inside black doesn't show from the outside.
Ken
ps (I did exactly the same (Doh) when I painted the first production unit...I looked at the original prototype and just copied..forgetting about the alignment required for the Neon Shutter...so you're not alone!!)