They are too rigid By Guest
Same as the other reviewers, these are not usable as they won't compress. They are too rigid.
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Not such a good idea By Udo
I agree with the other reviewer about this pin creating more problems than being a solution. I also use the cable tie method but use it to tie the two mating housings together. This will prevent from the connection coming apart and from sliding.
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more cons than pros By Karl
These sound like a great idea until you try them out. The roll pins are so rigid and the plastic housings are so (relatively) flexible that instead of the roll pin compressing, the two housings spread apart slightly to accommodate the pin. This makes the pinned connector pair a little harder to connect to a pair that is not pinned due to the slight spacing mismatch.
They also don't feel like they'll stay in place super reliably. If one comes loose, you've got a nice little conductive piece of metal bouncing around near your electrical equipment. That's a recipe for a really bad day if the pin finds it's way into anything with a circuit board.
Other than trying one or two out initially, they're all sitting in the bottom of a box somewhere. I've never had problems with connectors coming apart anyways. Running a small zip tie through the hole intended for the roll pin and zipping it shut around the back (wire) side of the housings works just as well with none of the side effects, and is easily reversible if a connector needs to be reconfigured. A drop of super glue in the dovetail joint as the two are slid together should work even better, but would be permanent.
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