Discover the restoration of a vintage two-speed hand drill! While the drill was still functional, its faded paint and worn appearance needed some attention. Instead of restoring it to its original ...

[The Q] solved this by effectively building a differential from the parts of a very old hand drill. Since the front wheel needs to rotate at the same speed as the rear, one long chain loops from ...

This method has had one of the widest distributions on earth, and it probably has been used for the longest span of time. Clearly, it’s one of the most difficult friction methods to use. But when ...