How to make a Murdoch Ornamental Award Winner: Architectural Lead & Metalwork Ltd with The Windsor Collar Casting produced sandcast collars manufactured for Windsor Castle. The project demonstrated the sandcasting technique from pattern to finished product of rainwater pipe collars that are used on the restoration work at Windsor castle. The pattern for this component comprised of a two-part section for the body of the collar and a core box for moulding a sand core, used to create the internal void which houses the rainwater pipe. Please view the video.