I went into a head shop a few years ago to get a new grinder and the old Indian guy let me look around than when I had one picked out he says "that's not for you you want this" WTF so I listen to him and he was right, the most important part was a teflon washer that stayed on one side. I have had grinders but they get stuck by good weed and I hate when I put it together and it wont turn or move. The washer prevents this. I have used it for about 5 years now and never cleaned it, and never go it stuck, my other one I need to clean every 5 days.