Hello, I borrowed a 88387 (25' hand/drill "drain gun") from a friend so I could try to open up my kitchen sink drain. When I got to the end of the 25' run, and attempted to rewind the cable, I found that the cable had disconnected inside the drum. I thought I had busted the thing so I went out a bought a new one for my friend. Got home and discovered this is a newer version. Well, the same thing happened with the new one. Got to the end of the cable and it became detached. This new one however, has a drum that is held together with 4 screws which allows you to replace the cable. On the older unit however, I cannot figure out for the life of me how to reconnect the cable as the drum appears to be a complete piece of plastic. The manual says nothing. Anyone familiar with this tool and knows what the trick is to replace the cable on the older version? Thanks in advance!