Title says it all. Have been reading and I've seen some people mentioning this. How do you do it? 

Instead of drilling though the center post you made a tunnel through the insulator? That works fine?
Why not just get an RM2?, they work GREAT!! And are pretty cheap!!
I cut a grove in the post on Patriot with a dremel.
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I have and love my RM2s. They are the easiest to build on and have a great vap. Several reason to try other RBAs.
One of the big ones is for fun and to see if you can do it.
The RM2 is chrome plated brass, some people have a sensitivity and want all SS. Rob now offers the IGO which is SS.
Even though the RM2 is priced very reasonably some people need a lower priced option. Rob now offers the IGO which is $13 less than the RM2.
The RM2 is not easiest to get dual coils in because of the position of the posts. Rob is planning to offer a large RBA that will be easier to do dual coils in.
I really wanted to try the Cyclone's airflow control top or AFC. I really like it, it's one of the slickest AFC solutions out there, Rob is going to be offering airflow control rings for the RM2.
The Patriot is huge on the reo. I don't really want to use a 22mm atty on the reo