1. Prepare the nail: Prepare the natural nail as usual and build the desired nail enhancement with gel or acrylic.
2. Choose the right size: Select a pinch stick that matches the nail width and the desired C-curve.
3. Position the pinch stick: Slide the stick from the front under the free edge so that it supports the curve of the nail tunnel.
4. Shape the tunnel: During the appropriate modeling or curing phase, carefully shape the nail enhancement around the pinch stick. If needed, support it with a suitable pinch clamp.
5. Remove the stick: Once the enhancement is sufficiently stable, carefully pull out the pinch stick and finish the nail enhancement as usual.
6. Clean: After use, remove gel or acrylic residue and clean the stick.

Note: Use only on sufficiently stable enhancements and do not apply excessive pressure to the natural nail. The right moment for pinching depends on the gel or acrylic system used.