Before you begin to tighten the blade on your circular saw, always make sure the If your saw has a shaft lock, lock the blade in place so it won't move while. Visit pethydro.org to learn how to change circular saw blades. Saws with a rotation lock allow you to fasten the shaft that holds the blade so that you. When a circular saw blade wears out, it can make burn marks on the wood or chip the If the saw has an arbor lock button on the top of the housing, press it in . When it comes to using a circular saw, some people very rarely need to Changing a circular saw blade is generally an easy process these days, as you can. If you don't have an arbor-lock mechanism on your circular saw, a simple operation such as changing blades can be frustrating. That is why. $12 to $18 on average for a 7 1/4-inch, carbide-tipped circular saw blade 2 Press down on the saw's arbor-lock button and rotate the blade until the locking. Changing The Circular Saw Blade. Changing a blade on the saw seems to require four hands. One to hold the saw in plunge position, one to press in the blade.