SC10W1 is for power feed (comes with lead cable).

SC10W02 is for direct ribbon to ribbon and if you need a 90 degree connector you need to use one of each.

They were designed for SL6 Ribbon but will also work on SL1 and SL3 Ribbon.

If you're using a smaller gauge wire and it will fit in the terminals, then yes it is safe to use your own wires.

Yes, we actually ship mini screwdrivers with every order so you don't need to hunt for one.

No, some connectors do not fit certain channels, please reach out to info@rjcross.com and or check measurements on spec.