Old school. Still have 3. A friend worked there for years and got me lots parts.
http://www.grasscity.com/us_en/protopipe-the-original-protopipe-deluxe.html#.VGl5u8m9ZUE
We had an accident where our dog got into the garbage and ate the leftover Cana-butter mash that had been thrown out. It was not good to say the least. He was high, high.....
If you have been growing that strain since 1971 and you still are not sure how to dry the lower branches, you need to think outside the box just once. Growing the same hermie prone plant for 40 years might not be the best thing to do. Have you ever smoked GOOD weed ?