Ko'r perchinning o'zagi to'liq tortib olinmagan, sinish sababi nima?

3. Mix boshi tushib ketadi: Perchinlangandan so'ng, mandrel boshi o'ralmaydi va perchin korpusidan tushib ketadi.

4. Perchin korpusining yorilishi: Perchinni tortgandan so'ng, perchin korpusi bo'ylama yoriqqa ega yoki butunlay yorilgan.

https://www.yukerivet.com/news/the-nail-cap-came-off-what-is-the-reason/