get some 1 inch diameter flexible black poly pipe ( 50 feet ) ... used for well piping .....
cut some ragged teeth in one end .... grab a 90 elbow or two ....
from the uncut end , cut off 2 pieces ... 1 foot and one about 18 inches ....
put the 90 in the fresh cut end and put the 18 incher on, drill and pin the 90 elbow with nails ... then slide the other 90 on and add the 1 foot piece ... drill and pin it too....
you now have about a 45 foot snake with a crank on the end, add a bit of water to the hand crank handle and you have a boring machine for clay ....
snake it thru ... attach a rope to the saw tooth end ( drill a hole ) ... pull the rope back thru the mess and hook up your chain and bricks .....