The quick lock vise is not a self centering vise.
This means that the rear jig is always at the same spot, hence the reference origin for this vise is not in the centre between the 2 jigs,
but it is in the centre on the X-axis (from left to right) and on the clamping edge of the rear jig.
If a specific set of jigs has more than one clamping border, such as the jig set for small plates, then 2 different reference points can be defined (2 different home positions).