For the top piece in the image below I've seen people leave it in, drill out the middle, or drill out the whole thing. Leaving it in completely seems wrong to me. I'm basically adding a barrel like in the website below but it seems like the air restricter would block most of the air.
It seems like it would be a good idea to drill a whole through the middle and seal the holes around the edges but I haven't seen this done. Just curious why it would ever be left in completely and if it is a good idea to just drill out the whole thing? Thanks for the help.
Edited by jumico, 24 September 2010 - 03:17 PM.