Request for a recommendation.

I am looking for a book which will interest a 12 year old kid who is fascinated by things mechanical.
The kind of kid who used to take clocks apart and put them back together still working (when that was possible), build a telescope or put together a radio, that sort of thing.
I remember seeing such a book and wishing I'd had it when I was twelve myself, but I don't recall the name or author.
As for myself, that clock never worked again, so I'm not much of a mentor here.
William Hyde