Modified locking C-clip design. It is modified to put pressure on the nut and allow access to the bolt. The modifications are crude, but sufficient for the purpose. As other reviewers have noted, the rubber pads are attached with flimsy double sided tape and fall off on first use. Generally a screwdriver is fine for normal use as long as you hold the rubber pads firmly in place. The ring was too big and thick for my application so I had to modify it heavily before using it.
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