Step 4: Carve the Connecting Thingie
The tool's leads to connect to the battery are not at the base of the battery connector: they're on the sides, near the top. So, you need something to get your wires up into the tool and touching the tool's battery leads.
I used a dried chunk of Great Stuff, the spray foam that is a pain to remove from pretty much any surface:
1. carve foam chunk such that, when it rests on the accessory connector, it's approximately the same size as the battery pack's lead
2. carve an 'arch' through which the 2 wires can lead to the terminals
3. if the carved foam is too tall, drim down to approximately same height as battery pack
4. run one wire to each side of the arch
5. attach aluminum foil to each wire and wrap the whole thing in duct tape. be sure you leave foil exposed, so that the tools leads can contact the foil on both sides. if (when) the connector won't slide onto your tool, trim off all the extra duct tape you used:)