What kind of smart design can be made in simple products

What kind of smart design can be made in simple products, semi electric stacker and manual stacker.
1. Smart mast roller, adjusting eccentric bearing ensure mast verticality, keep mast veridicality from
89.3-89.7 degeree.
2. Smart supporting leg, steel tube is inside of leg square steel, ensure strength of supporting leg.
3. Smart design to reduce the noisy when unloading running by a special screw with spring and tip.
4. Stronger backrest, full welding from front to back of backrest, ensure the strength.