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I really like these and recommend them highly. They seem to be of good quality materials and are well made. I assembled 8 of these in about an hour. Assembly is fairly easy to do if you strip the wire back correctly. Which is why I knocked 1 star off. The instructions tell you to strip off at least 1/2" That's way too much. You can't get the wires correctly seated around the post and then be able to screw the tip back. I'd say 1/4" to 3/8s" max. Then back the stripped wire back and you can insert the tip and thread it.
If you're going to do a lot of these, I'd definitely recommend some high quality wire strippers. Also, if you can find a solid piece of tubing a bit smaller than the threaded end of the tip you can use that as a tool to push the spread out wires into the base before putting the threaded tip in. It would be nice if Sewell included something like this with a bulk pack of plugs.
The Sewell Deadbolt Banana plugs are pretty easy to put together and they are very solid once screwed down. Use care when stripping the wire and folding the wire strands down through the barrel side onto the serrated sleeve of the connector. Then, hold the Barrel side steady and twist just the threaded banana plug side until tight! if you twist the Barrel side or both sides of the connector at the same time, it messes-up the stranded wire with the Barrel side's serrated sleeve and you have to start all over again. Remember to just hold the Barrel side steady and twist the threaded banana plug side until tight... You can also slide the serrated sleeve out a little bit of the barrel side to make it really easy to fold the stripped wire down perfectly, then push the sleeve back in (clearing any frayed and stray wire strands) from the thread path, or you will have problems starting to thread the two sides of the connector together with wire strands in the thread groves.
These are GREAT! Space saving design...shorter that others. Very easy to use, just takes minutes. When you plug these in the fit with just the right smugness, and they are color coded for + and - connections. There is enough of them in the box to setup a 7.1 system, or a 5.1 plus an extra zone with two speakers. They are also built very well...highly recommend!
I had a speaker fall off the wall (ice damming softened the drywall it was mounted on... surprise!)... The speaker, about 10 lbs and with fancy veneer, hung on the banana plug and 12-gauge wire and did _not_ come crashing down on the expensive wooden furniture beneath. Slight wall dings and no speaker/furniture damage. This application had not occurred to me when I bought the plugs a few years ago.
I have gone my whole life without using banana plugs and what a shame that has been. I've always just used the insert your wire into the screw on tab and if you never move it or need to access it, that is fine. These plugs give you an easy way to attach your speaker wires and easy to remove and move your AV receiver with minimal difficulties.