lots of great ideas on home made extractors here. What is the general wisdom on what type of bearing setup is recommended to hold the shaft at the bottom of an extractor (with a top mounted motor, either fan motor, belt/pulley or drill) would a ball/roller bearing set up be significantly better than a post in a nylon or bronze bushing? I'm thinking about easy availability of parts and ease of mounting at the bottom of a plastic barrel. What do the commercial extractors use?