Updated better method here: https://youtu.be/M3Ul-s9_MA0
Make your own homemade broaching tool for “drilling” perfectly square holes in steel.
In this case we are using it as a tool holder on a milling machine slotting attachment.
Long term projects here: https://www.Patreon.com/AvE
In this video I make a fixture for holding a split bowl to allow me to cut out the split area on my table saw.