I came across this video on Tennis Warehouse and hope it may help some of you who are using drop weight machines from Eagnas/Alpha or others operate in the same manner. It shows you how to change the spring in the rachet system. http://users.skynet.be/hvdb/
thank you. I tried that before and some of the link is not working. I am not replacing the spring in the drum. But would also like to know how to replace the string in the ratchet.