We recently spotted this somewhat decadent $25 Pedal Dummy from Enduro Bearings — a tool designed to help you spin your cranks when adjusting gears without any pedals fitted to your bike.
While genuinely useful for a dedicated mechanic assembling several bikes a day, arguably it’s not a necessity for most of us. That said, while we don’t really need one, that doesn’t mean we don’t want one.
The tool is exquisitely machined, featuring undersized threads for easy installation on the driveside and an exposed, oversized greaseless bearing (which is also replaceable if you ever feel the need) that serves as a handle for friction-free fettling.
There are some more reasonable alternatives available such as the Park Tools DP-2 for half the price, but this should fit in very nicely with our growing collection of premium tools.