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Step 5Prepare the Back of the Cartridge
This is the somewhat time-consuming step that separates the internet-bought clocks from the real thing.
To make sure the gaping hole in the back of the cartridge matches the small one we made in the front, we'll use a little bit of trickery and a pen.
Reassemble the cartridge without the screws and electronics and drill a 5/16" hole down through the preexisting hole in the front and on through the back. This ensures that the holes are lined up.
Push the clock shaft into the hole from the backside of the cartridge (is it getting warmer in here?). Trace around the clock so that you know where to cut. The outline will most likely fall over the side onto the beveled edge of the cartridge slightly.
Cut the rounded square out of the back and remount the clock into the front of the cartridge. Try installing the back of the cartridge and check for clearance issues. Trim back the square hole until the back can fit easily onto the front without interference.
To make sure the gaping hole in the back of the cartridge matches the small one we made in the front, we'll use a little bit of trickery and a pen.
Reassemble the cartridge without the screws and electronics and drill a 5/16" hole down through the preexisting hole in the front and on through the back. This ensures that the holes are lined up.
Push the clock shaft into the hole from the backside of the cartridge (is it getting warmer in here?). Trace around the clock so that you know where to cut. The outline will most likely fall over the side onto the beveled edge of the cartridge slightly.
Cut the rounded square out of the back and remount the clock into the front of the cartridge. Try installing the back of the cartridge and check for clearance issues. Trim back the square hole until the back can fit easily onto the front without interference.
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