I think you might be missing the point

TO: Reviewer:S. Carmona (Manhattan Beach CA) and OTHERS...^M
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I could be wrong but I suspect I have the same EDGE HOG edger as you guys. Just put the washer ON, then the BLADE, then the washer, and TIGHTEN.^M
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I know that the blade would have a tendency to SLIP, but only if it encounters INCREDIBLE RESISTANCE - in which case you would WANT it to slip. I originally thought this was the wrong blade, but after thinking about it, I realized that it actually is a good design.^M
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If you hit something that might bind up the blade, the motor will NOT burn up, but some slippage might occur. If that happens with me, I just remember to tighten the blade when I am done. Actually I tighten it before use ANYWAY - it is usually NOT LOOSE at all though. ^M
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It is an amazing edger, with CLEAN EDGES on sidewalks, etc.^M
For me the blades are working GREAT with the same edger you all have. I am not trying to be snotty or anything, just saying that even though it looks like the wrong blade when you first look at it, it funtions "safely" and does a great job.^M
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They always tend to wear down, that is my only complaint, but that is minor. They are worth it.^M
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Again, you might think by looking at it that there is NO WAY it would work since the hole is not the same, and you might think it would NOT SPIN or CUT (EDGE) anything, but it does work great.^M
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If you have any questions, I would be glad to answer them (here). If you suspect we have different edgers (I think not), I can post some photos of installing the blade on mine. Again, I am just trying to be helpful - not trying to start a "war". :-)^M
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Good Luck,^M
Greg

Not what it appears to be

The picture shown for the part is not accurate. The part you sent me has a round hole for mounting in the center. The picture shows one that is 'saturn' shaped, like the one that is on my edger. So, I have purchased a part that I cannot use.

Just as pictured

They may have had problems in the past but Amazon is delivering the replacement blade the photo shows. It is hardened steel!! I ordered the blade as a backup when I purchased my edger. I used the Black and Decker edger my father owned on the numerous lawns I cut as a kid. The edger lasted over 25 years and was given away to friends when Mom and Dad moved into a condo. It still had the origional blade on it. ^M
I've got a hint for those other reviewers who seem to go through blades. All those sparks you are seeing demonstrate that you are not properly aligned. Take your time, don't rush, you'll get a quality job and you'll save your blades.