So I've been running my own flowers into oil for the past 5 months. I use a cut down sstb and run only quarters per run (7g). My yields are are 14-20%. I only heat purge since it's such a small amount. Works fine and get shatters. I just got a glass tube from my lhs that holds 7-10 grams. It came with a grey mesh screen. I was told to use this screen instead of a coffee filter. I did everything else as I normally do. But I only got a 5.6% yield. I got .39 from 7 grams. I used Newport tane, as I always use Newport or vector. What could be the reason my yield was so bad? Same exact buds got me a 15% yield with my sstb? I was thinking maybe it had something to do with the Newport adapter tip not creating a tight enough seal/pressure with the glass tube? The glass tube also flanges out on the end where the coffee filter goes. Oh, and the mesh screen did let some bud particles into the oil, but the guy at my lhs said nothing would get through hahah. Can't really trust my lhs, as they don't know much about extracting lol.