Tintenfish
Since the required connectors are simple and cheap car connectors, it is very easy to use them for the socket. A bit hot glue will be ok to keep them in place.
The socket itself is mounted by using screws which are normally used for wood. Don't try metric or UNC bolts... even if You use something different than PLA. It doesn't work very well. Let the screws do it for You.
If possible, I used the upper part of the original power packs and the connector, which came with them. You can solder the wires directly to the machines, but I prefered the use of the original connectors. Some hot glue will do it, if You use it carefully. Don't try to fill it up at once.
.... And a fridge for several minutes for cooling the glue down. DON'T FREEZE! Hot glue won't be sticky, after being frozen! And frozen hot glue is pretty similar to glas. It can be broken!
The springs, which usually keeps the power packs in place, probably will get lost. Use two screws from the side, it works!
Normally You don't need additional fuses, except for the screw driver. The designed voltage range is probably between 12V and 13,4V. The connector for the lighter socket has got a 10A fuse. If the drive is blocked, it may gain more than this. I used a car fuse 15A with holder instead.
The wires... I used 1.5mm^2 copper wire. Remember, the tools gain several ampers, if blockated. Be carefull! Too thin wires my get hot and red and glowing... Molten or burning tools are no fun! See the screwdriver! It may gain something above 220W!!!
The connectors:
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William
MaBe42
Daren Schwenke