I'm getting to the point of laying in ladder system for my layout but I'll be using a fair amount of flex track due to "non-standard" curves. Brass track I can find but am looking for a source for flex tie strips. Tried Aristo and they sent me a box of 4' diameter strips and the sales person didn't seem to understand what I need since minimum curves are 5' radius. Any and all help appreciated. Estimated length needed is 500 feet.