Check the "travel dial" should have a lever or knob to set the depth.
If not at least it should have a threaded hole for one.I do not believe
it is possible to put a threaded rod depth stop and or quill lock on a
machine that was not set up for one. You would need a yoke that goes
around the quill and a way to mount the yoke on the drill press
body.The quill lock is threaded into the yoke on this type of machine.
Any drill press without a quill lock is very limited.
mike