How to replace a spark plug and set the spark plug gap

I was using my Honda Harmony 215 lawnmower for the first time this spring and it ran fine for the first half of the yard.  Then its started running rough, so I assumed it was a carburetor issue.  I cleaned the carburetor and decided to also clean the spark plug.  When I went to remove the spark plug I found that it was broken into two pieces!  I don't know how it ran at all!  Here's a video that shows how I replaced the spark plug:
Make sure that you always adjust the spark plug gap before installing the new spark plug.  This video will show you how to do it by checking the gap from the old spark plug.  You can also check your owners manual to see the proper spark plug gap.


Here are the two tools you will need to complete a spark plug replacement and to set the gap:

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