py spring material used in BNWF method

[rainandcm]

Hello,

In the forllowing website, it used "PySimple1" to create py material for zerolength spring. Can I use other command (instead of PySimple1) to create the py material?

I tried "hystereticBackbone ReeseSoftClay" but it does work. After run the program, it shows "material doesn't exist".

Can you give me some suggestions?

Thank you.