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Increase Wilson eight inch sweep brace following the very early Taylor patent. 
 

Increase Wilson brace
Other side
Heaqd view
Head view
Chuck view
In order to disassemble the head, first loosen and remove the bronze screw, which can be done with a wide-bladed screwdriver, preferably with a square shank that can be turned by a wrench. It helps to force the screwdriver blade into the slot of the screw with some sort of press or woodworker's clamp, as the screw has rarely ever been undone previously. Next, use a cold chisel to cut off the staked end of the quill which has been forged over the hard steel washer, freeing the pad so that it can be taken off the wrought iron frame of the brace. Use a gear puller to extract the remainder of the worn bronze ring, and replace with another ring that tightly fits onto the frame, and which is the correct length to get a running fit of the pad between the steel washer and the bronze ring while leaving enough of the quill to be peened over the washer so as to hold the pad in place.
B&D-187
Price: $45.00 plus shipping
  

Made by Increase Wilson in New London, Connwcticut. There are a great many of these braces still in existence, and most of them have the bronze ring below the head that is meant to bear the force exerted on the bit during drilling, but which was rarely lubricated adequately. This brace shows the effect of such abuse, as there is a rim of extruded bronze jutting out from the worn side as seen in the bottom center image at left. On some of these braces, the bronze ring is almost completely worn away, and I have had to disassemble the head in order to install a new ring. The technique for accomplishing the replacement is recounted at lower left. 
 

U.S. Patent No. 9814X