The box with two switches usually mounts at the front of the table and the two stops fit into the slot along the front edge of the table so their position can be adjusted so they hit the buttons at the end of the cut.

When I fitted a unit to my VMC I had to remove the plate on the centre front of the table and drill and tap two holes to locate the switch unit . Take care with its vertical positioning. The adjustable stops need to press against the limit switches

Brian

If I fitted that arrangement, I would have four limit switches. 2 adjustable ones, for setting up repetitive cuts, and 2 fixed limits at the table extremities of travel – to prevent any really serious damage.

As it is, I’ve not bothered to do that on either of my mills – I simply don’t let them run unattended. Most of the time the tables are fitted with more than one item – either a couple of vises or a vise and a rotary table.

I just leave the adjustable ones at the far ends when they are not being used which is 99% of the time so if I did leave the feed going they are always there to stop the table at the extreme limits of travel