If one does not know the size of ring for whatever finner (sic) , go to your local jeweler and ask if you can borrow their ring sizer . . .(you may have to bring the person receiving the ring ;) )
BIG thumb up on that , lurifax.
The alternate geneator has been done, an 'ible of its own . . . stepper motor with a larger diameter plastic wheel than the motor housing , attached to bike with a rigid metal strip to the thru bolt on rear wheel brake. The metal flex strip can also be clamped to rear seat stay , with plastic wheel centered over tread. The plastic wheel is centered on tire tread , unless tread is full knobby . . . and away you go. Definitely want to use regulator , these put out up to 30+ vdc , low amperage . . .Bike Generator , Doug Costlow (not sure if the last name is a pun or not . . . )
Gorilla Glue - strengthens when wet. . .
Making a simple laminate longbow
Red Oak Pyramid Bow
Stationary Bike Generator from Washing Machine
A Vertical Wind Generator from Washing Machine Motor
Rec-liner long wheel base recumbent
Hard Wired LED Cube: [No Programming]
LED CUBE: Without Programming [How to Build]