O-ring comes loose. I tried to make my own adapter online with all the instructions and wasted two days. I ordered this out of sheer disappointment and for the most part it works incredibly well. I've read previous o-ring reviews and was very careful when slowly pulling the tool out. Until I got to the last #7 cylinder and lost the o-ring while pulling it out. This is not necessary to get a good seal as I retested a simple cylinder just by hand tightening and the results were the same. It is necessary to provide a small buffer for removing the tool after the cylinder is pushed in. The solder joints are very thin and even the insert was finger tight, subsequent removal without an o-ring to provide cushioning was flimsy. I was afraid that one of the connections would fail. The size of the tool is perfect for the 7.3 psd test. I could try experimenting with losing the small o-ring and try fitting a larger o-ring over the threads.
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