How does the lock work and which angle should I pick?
The roller wedges between the handle and the sloped face. If the wedge angle is smaller than twice the friction angle it locks by itself: on a dry wooden or painted metal handle friction is about 0.3, so the limit is around 33°. At the default 15°, friction of 0.13 is enough. The lock still relies on friction; use a TPU roller on slippery handles.
- General use: 15°
- Slippery, polished handles: 10-12°
- Shorter body: 20-22°