I love TCSS stuff, but this one has been problematic. I cannot, for the life of me, get the locking ring into the grove to hold the insert. I have watched videos and keep trying, but I cannot hold and squeeze the locking ring without my needle nose pliers coming out of the notches. If I had been more successful, I would recommend this as well!
They can be hard sometimes, you can always glue it in place of you never intend to take it off.
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