Article: Using a plugging chisel and sledge, chip the cinder block into pieces. Remove the block in chunks as you free each piece from the surrounding mortar. Chip out the mortar, then brush away any additional dust or debris before putting the new block in place. Wear safety goggles while chipping the block out to prevent eye injuries. Purchase a bag of pre-mixed mortar and pour it into a bucket or wheelbarrow. Add the required amount of water and stir it with a shovel until it has an even consistency. Let the mix sit for 3-5 minutes before applying it to the wall to let the mortar absorb moisture so it will stick to the cinder blocks better. Using a trowel, add a 1 inch (2.5 cm) thick layer of mortar around the top, bottom, and sides of the empty space in the wall. Keep the layer as even as possible to avoid creating tight or loose sections in the wall. Slip the new cinder block in place with a trowel, then scrape away any excess mortar. Let the mortar dry for 12-24 hours, depending on the mix. When the mortar is dry and stable, it should turn a light gray color.

What is a summary?
Chip out the old cinder block and mortar. Mix the mortar. Apply mortar around the edges of the cavity. Set the new block in place.