I used to own a NEOS 1000 years ago but sold it when my wife and I started a family. Since then I've been stringing on my old Klippermate. But I've begun to string a higher volume of rackets over the last year. Recently, I had a chance to buy an Eketelon DE really cheap and I jumped at the chance. The guy that sold it to me also gave me two extra tension heads. They are the older spring-loaded crank style that the NEOS design is based on. However, I've calibrated them and they work fine. I'm wondering if they are worth trying to sell or am I just better off keeping them for spare parts. Also, having the Ektelon I am going to try and sell my Klippermate. It was purchased probably in the early 90's and works fine. I have all the parts and the two original floating clamps. Any idea what a fair price is to sell this machine for? Your feedback is appreciated!