The rounded corners were made to fit the needs of the channeling on the outside of violins and the shape of the inside of the top and back plates, and the curves of the scroll. Corners are dangerous.....one bad move and lots of work down the drain.
The real key here, I think, is the thin dimension of the steel. These are really flexible. The long, narrow one came in handy scraping the belly of that hickory bow as it would bend and make one, full width shaving . An old Exacto saw blade, with the teeth filed off is about right. There may be some other common things that would work as well.
And, Yes, some of this SPRING steel can be found in the FALL. (Thousands of comedians out of work, so what do they do? build bows and read this forum!!
) I usually get it with the bark already off. Geez.......
These scrapers will level a surface in 2-3 passes after the toothed plane is used. I'll post the toothed plane in a separate thread. I brought it home today as there has been no time to just take pictures lately. In fact, I couldn't even steal time to work on a bow today.
piper