The idea is great, but like several people, I lost my attachment quickly. I did not receive any instructions with the XXL, and had some large washers that made know sense as to their use reference the design. I torqued the attachment and nut as much as reasonable, but had to keep tightening it over and over. I eventually lost it in muddy water. While it worked, it was very good at trapping the disc and allowing it to be retrieved. I have since learned that some do come with instructions that highly recommend you put Loc-Tite on the threads of the attachment. Would have been nice to know.
