Review on Z Hex Flush Internal Threads with Threading by Mario Schultz

These things are good once installed, but it wasn't easy to install. I've had a few that keep breaking where the hex key is inserted to install. Basically I had to use one to start carving wood, it would break. I would remove it with a pair of pliers and then proceed with a second one. In the end I decided to slightly change the installation method. Once you start pausing the streams, go back a little, then go down a little, then back it up a little, then go up, etc. This method was pretty slow, but I was eventually able to install it without to damage them. If you just try to use brute force, you'll break it every time. Luckily it was a 25k pack so I had plenty of spares!