Yeah wish I would have contacted Mark to find out before he sold the company.The normal route would be to contact the manufacturer.
But I think he´s gone belly up, maybe someone knowledgeable can chime in here?
BTT:
the coupling is a standard part that can be found in industrial supply shops.
But the coupling bolt is steel and the brake lever is aluminium iirc so you should dismantle it first and check which part has the scoring.
If the wear is in the hole in the lever things get more complicated.
MFG Carsten
I live in the US but you've helped me to look in the right direction.I don't know where you live, but german Amazon has so called Gabelkopf.
Just take measurements and choose the right one.
MFG Carsten