You know how cutting off posts square and even is almost impossible? How you get a raggedy-ass cut if you try to use a circular saw because you can't ever line up the multiple cuts needed to get through a 4x4 or 6x6 post? Get some scraps of angle iron and bolt them together like this to make a jig to guide a Sawzall blade. Clamp it on to the post using the long bolts, slide the saw blade into the guide (use washers on the short bolts between the two pieces of angle iron to act as a spacer for the blade), and it's a perfect, square, smooth cut every time. If you're careful squaring it up, and getting it securely clamped, it even works on round posts.

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