我曾成功地使用过壁挂钟，也很容易拆开。
I've also successfully used wall clocks. which also come apart easily.
壁挂钟所采用的电磁体可能不容易拆除，但是钎焊上一根电线还是很容易的，而且可以随电磁体正常工作。
The electromagnet in a wall clock may not be as readily removable, but it's a piece of cake to solder new wires to, and it will work fine with the electromagnet in place.
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