Stanley opted for two different methods of constructing their pressed steel block planes. S18 used one stamped piece to hold the lever cap machine screw, and another to hold the depth adjustment mechanism.Both are riveted in place, using at least 10 rivets.
The nickel-plated lever cap is held in place by a machine screw with a large pancake shaped knurled knob.
The blade depth adjustment mechanism is of the sled-type, manipulated by a machine screw, typical of low-angle block planes.
The throat adjustment mechanism uses an eccentric cam that’s unique to this plane.
The cam pivots directly below the knob with the arc-shaped slot swinging over a small, projecting pin that’s peened onto the sliding section, moving the throat piece. S18 had a unique lever cap, which added to the complexity of this “low-cost” plane.
The No.118 was advertised as the ““, it seemed to be geared towards manual training classes.
The entire plane is made of steel, with the blade sitting at 12º.The stud used to maintain the position of the lever cap was fixed in place (i.e.welded to the frog before it is spot welded (see CONSTRUCTION section at the end of this post).The No.118 alternatively uses a one-piece frog, and appears to be spot-welded to the plane body.On the S18, the fore finger-rest and rear thumb-screw thread are attached to the plane body by spot-welding (look closely under the plane and you can see the tell-tale rings).What is interesting about this is that even the sled is constructed using a piece of folded steel. S18 is the indestructible version of the No.18, built between 19. This may have been the most expensive pressed-steel block plane to manufacture, because it was likely the most complex, owing to throat, blade depth, and lateral adjustment mechanisms.