No grovelling needed- I appreciate the information as always. I'm not sure who made these- they were supplied with the kit by the (eBay) seller. I do know they are very heavy, and that the pin has two "ears" peened into the sides of the pin at one end. And that the pins I had to pull to shorten teh tracks were very tight (although that does not mean that they all are, or will remain tight). I will watch carefully.