The inputs are attached to by screw-down terminal blocks and include two ground terminals.
The trouble with this screw-down machine is that the round handle doesn't always give you enough pressure, especially if you are trying to press a lot of bulbs at the same time.
It is best to use a case with screw-down lids, so the solution doesn't leak.
As far as wiring goes, follow the plans for the boards in order to end up with screw-down terminals that are easy to connect to.
Clip-in mount points are used, rather than screw-down hex nuts.