Just FYI, that's exactly the same details as the link Glen posted early on in this thread.
I understand the difficulty and I wonder why there was no threaded option? I know it's plastic and it's good to have a tight fit to ensure no slippage, etc, but really it was a bit excessive. Also, even without threading the "technology" to lock in place for these holders is well known, so again a bit strange.
If you can get past the above, I think it works well enough.
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