Take the two pieces of 2 x 3 2-inch sheet metal and bend them into a bracket for the terminal board.
Bend a 2-inch flange on each 2-inch end in the directions indicated by the side view of the sketch. Drill
the foot of the flanges for sheet metal screws and the tops to take 632 machine screws.
Locate the foot holes on the sheet metal on the back of the oven so the bracket will just clear the back
brick. These brackets and the terminal board form the clamp to hold the brick in place. Fasten the
brackets in place with sheet metal screws.
Cut and prepare the asbestos shingle and attach it to the brackets using the four, 6-32 machine screws.
The asbestos can be broken successfully if it is first scored deeply with a scratch awl, and then
snapped over a sharp edge. The asbestos sheet is the type normally used as siding to protect wooden
structures. Before assembling the asbestos to the bracket pieces, drill four holes into the asbestos to
accept the brass machine screws that will be the electrical terminal posts for both the Nichrome wire
elements and the line cord. (See illustration.)
The brass machine screws should now be inserted and the hex nuts tightened. Next, remove this
assembly, place the back brick into position and reassemble. Be careful so you do not disturb the
Nichrome wire leads, as each Nichrome wire lead should reach one of the brass terminal posts.
We should fillet all the firebricks on the inside with high temperature furnace cement; this is done by
spreading a fillet of cement with the tip of the finger to form a 3-inch fillet radius.
Place the metal door piece face down on an insulated surface. We can position and weld the 3 inch
steel rod or brassed in the correct position. The end of the rod should extend three inches beyond the
width of the door and should be flush with the face of the door.