Hmm, what I figured. I bought what was branded "Quartex", which was a German brand from the 90's and early 2000's. But the guts are "Sheng Bang" all inside.
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For the normal usage, the movement is held to the face with a nut.
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But for cheap wall clocks, the face is just paper. So you are going to need to grind off the old mounting tabs and then glue on the new movement.
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Except the shaft of the new movement is much longer and would go in too far and touch the back of the face from the inside. So I had to cut some wood shims from paint mixing sticks and glue those first.
That gave me just barely enough clearance.
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But now the movement sticks out the back side so the clock won't sit flush on the wall
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