LZH finger trainer(Stroke, cerebral hemiplegia, hand exercised appliance)

The finger trainer I designed can work out fingers for stroke and hemiplegia patients, as well as for normal people, depending on the strength of the springs you use. The finger trainer is flexible, can use rubber or metal springs, can adjust the length and height, can use the left hand or right hand, can use a screw lock or magic sticker to fix its arm, oval parts can make up for different finger length.
Additional materials required:
Round head cross screw, three M3*5, five M3*7, at least ei