The Stanley 113 is a plane for planing curved surfaces. It has a flexible sole, able to assume a concave or convex shape, with a variable radius regulated by turning a large knob. A toothed gear mechanism guarantees the correct sole movement. The #113 iron is identical to the Stanley #3 one, the size being 1 3 / 4 " (4.4 cm).
The lever cap and the cap iron are different from those of #3, so you need pay attention to this detail when buying it. My # 113 was in good condition, just a lot of surface rust. I proceeded to disassemble the plane into its parts and treat them with a vinegar bath.The flexible sole should be dropped from the metal arms using a punch.
The sole is welded to a dovetail shaped piece; it fits in the body plane. To take it apart I first lubricated with a descaler (WD40) and then gently hammered it using a punch of a suitable form (for the purpose I used a more little hammer, placing a smaller cardboard piece 
to protect from blows; alternatively you can use a wood piece of suitable form). If your sole does not want to move, better stop the action for avoiding damages to the cast iron parts, very difficult to repair! A common #113 defect is a mismatch between the iron seat and the mouth.
The blade does not not rest properly and could create problems in planing (chattering). To solve this problem, I simply added a 
couple of shims (business cards are great) on the plane seat. The flexible sole should be free from rust. Use sandpaper attached to a flat surface, paying particular attention to the mouth area. The plane must be used with straight shots following the workpiece horizontal axis. It is also useful for the chamfer job.
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