Introduction
Whether your circular saw blade is worn out, or you just want to switch it out for a different style, it’s really easy to swap out blades on pretty much any circular saw—and it takes just a few minutes.
This guide uses a Ryobi P504G circular saw, but the process is very similar for most circular saws.
Tools
Parts
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            Press and hold down the blade lock button to keep the blade from turning while you loosen it. 
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            Loosen the arbor's hex bolt in the center of the blade using a 5mm hex key, making sure to loosen clockwise since the bolt threads are reversed. 
 
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            Set the circular saw on its side and carefully lift up the blade to unseat it from the arbor. 
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            Slowly slide out the blade. 
 
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            When inserting the new blade, be sure to note its rotation and install it in the correct orientation. 
 
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To reassemble your device, follow these instructions in reverse order.
3 comments
Hello!
I learned a lot of important things, but I have a Question that is this Circular Saw perfect to cut Concrete Pavers?
I think you need a cutting disc in your circular saw
to cut concrete.
the problem is that cutting concrete with a concrete disk produces a lot of concrete dust. It will kill your machine. It is not possible to stop the dust by pouring water as you would do with a tile cutting machine.
vief -