[EC900]

Speaking of a matter of time…
It’s been 10 months (March 2023) I ordered the original K-Spring and never received it from Germany and all efforts to contact him and the postal service and my $62 USD went unanswered.

In the meantime I had a company make a few and they functions well. Few handy people as mentioned here also made these available.
FWIW there’s no patent for springs. A simple torsion spring (e.g. mouse trap spring) with couple of bends.
Advice - Don’t send payments for anything via Friends and Family.
I have some prototypes available that if I get around to it, I’ll find a way to sell them off so nobody will get burned out of their $ if shipping is lost in mail.