[AMRadio] Ceramic feedline spacers

[AirRadio]

I have a bunch of 2" (hole spacing) ceramic feedline spacers, they have a hole in each end with a groove running around the outside, now here's the question,( and I am only asking this as after looking for most of the evening here I cannot find the answer anywhere) Does the feedline wire go in the hole or on the outside and how to fix the wire to the spacer, I would assume the feedline wire goes in the hole and a wire twist holds it there, however, some say the feedline goes on the outside with the wire twist from the inside.  
73 Max