Build this 60 minute timepiece with the hand blown hourglass insert form National Artcraft. The insert cost about $13 but there is a minimum order of $30. The good news is that they carry lots of nice craft supplies. You could also order three and make some unique Christmas gifts.
The insert is captured between the top and bottom by drilling 1/2" holes. Each end of the insert has a nipple. Just drill half way through the wood to make a pocket. As you assemble the pieces just center everything up and tightly capture the insert between the top and bottom. Use rubber bands to clamp it together while the glue dries.
Use what every finish you prefer before assembly because it's very difficult to mask off the glass after it is inserted.
I also found another source for an insert. Rockler sells the part for $26. There's is 11" tall so this pattern would have to be modified to fit.
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