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Learn how to transform a hefty cinder block into a nifty birdhouse. It's massive and clunky, while birds are light and graceful -- a great study in contrasts.
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Drill a 1/2" centered hole through the smooth top of the cinder block (opposite the side with the groove in it) using a masonry bit.
Slip a round washer onto an eyebolt, then thread it through the hole you drilled in Step 1. Slip another round washer, a lock washer, and a hex nut onto the bolt and secure with a wrench.
Using a jigsaw, cut two 5-1/2"-long boards from a 1" x 6" piece of pine.
Place the cinder block on one of the 5-1/2" boards so that one of the sides with an open rectangular hole is face down. Reaching in from the hole on the other side, trace its profile on the board. Then, flip the block over and place it on the other board. Again, reach in and trace the profile of the hole that's face down.
Use a jigsaw to cut the boards along the lines you traced in Step 4.
Insert one of these boards into its corresponding rectangular hole so it's flush with the block surface. Then, place a piece of scrap wood beneath the other board and drill a 1-1/2" hole through the center. (This will be the birdhouse entrance.) Insert this board into the remaining rectangular hole.
You may need to sand the edges of the boards for them to fit in the rectangular holes. If the fit of the boards is too loose, secure them in place with silicone sealant.
Using a handsaw, cut a dowel to about 12" long. Use a hammer to tap it into the groove that runs along the bottom of the block. The dowel should extend a few inches beyond the front of the birdhouse to form the perch.
Tie the rope through the eyebolt (be sure to heat the ends of the rope with a lighter so it doesn't unravel), then hang from a tree.