Very easy to insert and stick! I received M3 .5 inserts (short) and preferred the 5.4mm diameter x 4mm deep cavity. I've used my cheapest pointy tip non-temp controlled soldering iron and haven't had any problems with it so far. They HAVE a top and bottom, see the second from the left on my test stick in the picture. I installed the insert and used a long screw there and pulled as hard as I could with pliers to lock the channel a couple of times. It's very well established. I like using them!
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