Seriously - all you have to do is choose your insert (widely available and again there's a huge range at Clockparts.com), drill the right size hole (a saw-tooth or forstner bit is best for a nice smooth edge) and pop in your insert - job done!
Apart from selecting the insert you want, the only consideration is the thickness of your piece and the thickness of the insert. Insert clocks are designed to fit in a flat bottomed hole - hence the use of a saw-tooth or forstner bit, which leaves a flat bottom, but if your insert is thicker than your work you might wish to cut a hole right through and have the clock protrude slightly from the back. The best thing to do is check all your measurements before you start, then you can either choose an insert to suit or make your segmentation to fit a particular insert.
Added interest and value?
I reckon for five or ten dollars you turn your scrollsaw segmentation into a clock that few people will ever have seen. How much value that adds is up to you - but it's got to be way more than the materials and time involved.
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