Scrapers are not rocket science! They are only sharp smooth objects. I have wrapped a piece of nicely shaped broken window glass with enough tape to protect my hand while I used it. It made a finish that did not need sanding! That was also an old method long used by carpenters and wood carvers to finish their projects. Heck, they find lots of "stone age" scrapers of agate and obsidian in archeological digs round the world, and in common use most places!
A scraper "scrapes" if flat honed to a angle less than 90º or it cuts a superfine chip if the edge is burred over to make a microscopic cutting edge. Its shape is to be determined by the job it does. It really is only a piece of metal with a burr rolled onto a polish-honed edge. I used to use a Swaty to do my final honing and a polished drill shank to roll the burr. The back of a utility throw away blade or even the edge or one half of a scissors makes a good scraper.
http://i1168.photobucket.com/albums/.../scraper-3.jpghttp://i1168.photobucket.com/albums/.../scraper-2.jpghttp://i1168.photobucket.com/albums/.../scraper-1.jpgHere is a link to another thread and scrapers are used in Video#2 and #3
Techniques of Workin Tortoise Shell
Cheap, easy, dependable and low cost! What more can I ask?
~Richard
A handy link:
Sharpening a Cabinet Scraper