Ok, just hear me out!! I have read several threads tonite about using carto/atty for dripping and sampling juices. I have read to blow out the old juice or the primer from the threaded end out to the drip tip and I have read to blow out from the drip tip and out the threaded end! What is the correct way to blow out the 510?? Please clarify for me as I have purchased some 510 Boge's and some Cisco atty's as well.