Editorial Product Review:Amazon.com Item Description:The Werner Level-Master automatic ladder leveler easily attaches to Werner fiberglass and aluminum extension ladders for even support on uneven surfaces, with automatic adjustment up to 8-1/2 inches thanks to the self-leveling design. Each leg automatically slides down to the surface, then locks securely in place. The Level-Master adds 3-3/4-inches of width to your ladder for greater support and longer spanning capability. It will not decrease the duty rating of your ladder, and it includes two levelers for each rail of your ladder, mounting hardware, and instructions.
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Customer Rating: 
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Werner Level-Master
A real "life-saver" on unlevel surfaces, but a couple of caveats.
First, download the instruction manual from Werner before ordering. Some models of Werner ladders require an extra installation kit. Secondly, read the instruction manual from front to back (several times), especially when you get to the part on having to cut the bottom rung off of your existing ladder. That's where it gets scary. I've never had good luck with straight cuts with hacksaws and was lucky enough to rig a jig for use with a metal cutting blade on my miter saw. Mine came out perfectly but not without angst. The whole project lasted over the course of two days. Bottom line: it was well worth it and I feel much safer on the second-storey.
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Ingenious! Works on my Davidson.
These work by a square shaft that runs through the bottom rung into pinions riding along a rack inside each foot housing. When one leg is pushed on, the other leg extends, then when it's loaded (just the ladder weight is plenty) they lock! If it's uneven, pick it up level and put it back down. Pretty slick. I feel much safer now than before with my blocks of wood! I looked at the other types of levelers, but you need to bend over each time to set them, for my back these are worth the extra bucks and time to install. (Regarding bucks, these seem very high quality, everything is Al, Chromate or galvanized. The only plastic is a cap atop each leg, though these aren't critical for operation. Regarding install, took me 3 hrs).
I put them on a 24' Davidson Aluminum ladder. Templates are available for all Werner ladders, but not for other brands, so I had to play around a little before drilling. (Make sure you leave enough room to get the nuts on from the inside! I put it all the way against the back so that the upper section of my ladder wouldn't contact the nuts/brackets when lowered, but almost couldn't get my wrench under the ladder sides to tighten them!) Like another reviewer, I couldn't see any reason to cut off the bottom rung, I'm curious why they want you to do that.
The installation instructions are available above (.pdf file), I'd recommend reading first if you are like me and want to put them on a non-Werner ladder.
Customer Rating: 
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Why did I wait so long?
I always seem to be working on uneven ground with my ladder. I would use pieces of wood to try to keep it straight, which by the way can be dangerous. This level master makes it easy to get it straight and secure. I plan on purchasing one for my shorter ladder now
Customer Rating: 
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Installed by a non-handyman
I would not be classified as a handyman. Installing took a good 2+ hours but it was worth it. They do everything they say they do and it made painting my house so much easier and safer.
Installation needs to be done slowly and methodically. I messed up a few holes because of missing direction steps. Take your time and make sure you allocate enough time so you are not rushed.
Biggest thing to remember when installing I found was, when one leg is extended...the other leg is not. May seem elementary but if I had remembered that I would have not had to undo part of the install.