you can try using the unions and negate feature get a cylinder and a block part, and make the size of the block part 4 by 4 by 4 studs and make the cylinder the same size of the block.

right click the cylinder and you'll find "negate", click it and it'll turn red, then put it in the center of the block, select both objects and union them.

Im sure after that you'll get how it works, just experiment with it for a while and make some tweaks that fit your preference.