boom. After the boom has been improved several times, it has been improved in many aspects compared with the past.
1. After the boom has been improved several times, the surface has been nitrided and shot peened.
2. Most of the previous booms have sharp edges and corners, and the force on the edges and corners is obvious, no, such as a circle, and the force is uniform, so now the performance is not reduced, and the edges and corners are optimized as much as possible.
3. The pivot pins connecting the booms are now made of high-standard, stable booms.
4. In the past, there may be a risk of cracking due to uneven force on the welding points, but now the welding points are spread reasonably.
