Ya you were right. I was always told bridge, but that does not mean it's right. I did a lot of scraping when I was young as I worked for an old machine designer and rebuilder. That would be good for me. Thanks for that info, I will look him upI'm not familiar with the term "bridge" straightedge. There are two general types that I know of and that's camelback and parallel. I assume that you are referring to a camelback. If you want to do all the machining and scraping yourself, Gary Martin from Martin Model and Pattern sells bare castings, I purchased an 18" one from him, I think he has longer ones as well.