Review on VANICE Bike Chain Keeper Sleeping Hub Tool Holder Frame Protector for 12mm Thru Axle - 5 in 1 Dummy Hub Bicycle by Andrew Lyons

I didn't quite understand how this would work and there are two possibilities. First, you can use a round plastic part with its own thru-axle. Second, you can use it as is by unscrewing the two sides (the screw goes through the middle) and reattach the supplied axle by screwing in the unscrewed side. To the right of the round piece of plastic, the axle fits perfectly into the inside of the derailleur axle/hanging hole. Put simply, it's easy to understand.