internet search has netted various sources to buy, but none how these were made.
would a die stamping machine to be used for the upper, and cut off machine for rolls of spring stock the lower? and a crimper to hold them together?
manufacturing plant planned for the model railroad and thought this to be a good choice: raw materials in, finished product out, many interior details.
thanks

Have you seen this ?

https://www.airborne-cricket.com/technical.html

H.P.

wow; perfect thank you. I had seen the "purchase" page but did not explore far enough!