They also prevent the edges of the blade from digging into the wood, which is apt to happen on softer woods.
They do not bow the blade a bit, like the #80A regular scraper blade, made of softer steel so that its edge can be rolled over, is held in an adjustable (pitch) holder.
Blades and irons are mostly full-length and are either sharp, ready to use or capable of being sharpened by the purchaser.
Defects, such as pitting and other detractions, are always noted in the item descriptions.
The knobs flank an adjustable L-shaped cutter, which protrudes through a large, circular opening in the plane's sole.
I shows wear at corners and edges, the book itself is fine; the Vol.
1919 catalog of saws adn saw tools, complete and fine; plus a YANKEE TOOL BOOK by NORTH BROS.
A grooved post receives the cutter, which is locked into position by a thumb screw activated clamping collar.
This collar, as well as the cutters, are very easy to lose, and these planes are often found minus them.