need help finding a vendor

Which Amart vendor sells flexi-focus cables for ETX scopes? I bought an ETX and was sent a cable that had never been attached. I can't figure out how to attach it, as the piece that is supposed to slide onto the focus rod (where the knob was originally) doesn't slide on. It appears too small. I'd like to contact the vendor and ask some questions about it. Thanks!

Anthony, You might check Ken's Rings & Telescope Accessories. He has some type of flexible cable advertised, but I think it's for slow motion controls. DR