Hello all, have been subscribing to newsletter for a year or so and thought I would join the forum for answers to questions. I live in central lower Michigan and have a upright gas smoker and a bullet style charcoal smoker with a few mods from other forums. I have a pit IQ on the bullet and love it. Now to the question, I have smoked a few things over the past couple years including a few pork butts, bone in. Today I picked up a pair for this week and the butcher told me to "make sure I remove the gland at the end of the bone". Have never done this and I am puzzled. He said it is like a big gelatinas sack. Has anyone done this or heard of this? Thanks up front for the help.