For connecting and disconnecting Shimano Di2 wiring harnesses and shifter plugs, use this Shimano TL-EW02 Di2 E-Tube Wiring Plug Tool.
B-Stock - This product has one or more B-Stock units available. These units can be purchased at a discount (see option select). B-Stock units were returned from other customers and may have missing or damaged packaging materials. These units are otherwise as new. The full manufacturer warranty applies. Click Here for more information.
Mfg PartNum: Y6VE16000
The Shimano TL Ew02, is good for removing the wire plug from a component (derailleur, junction box, shifter, battery, etc). Used in assembly of the system, this tool assists to wire plug connection without yanking on the wire. The investment is worth it, as the wires are not cheap!
I bought this as part of a project to add the wireless device to my Di2 setup. It's one of those things that you might be able to do without, but it's so cheap that I decided it was worth it to avoid damage to my cables. It works as advertised and I had zero anxiety regarding unplugging cables, or plugging them back in.
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