hy, i don;t have exp with hass, but for some similar tailstocks i used a long wrench; may be needed to use a 2nd person to keep the allen key pressed500 foot-pounds and so far we can't even break then loos
not all models have jackwcres; unmount the big screws 1st, then perhaps it will move free / kindlyThis is where the jack screws are. In the second pic there are no cutouts, and no jack screws that we can find