My wife grabbed one right away and began using it to
call the dogs. In the interest of time, I made them all the same pitch ( same length sound chamber ), but different sounds are easy to make just by drilling the chamber deeper.
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Always a pleaser to the young. Some old toys are unbeatable.
Wood bolts with washers and nuts. 1.5 inches diameter
I began using the big threading set to make actual vises for workbenches when I had thoughts of teaching shop class to kids. Unfortunately, the liability issue is too much for me....sad for kids. But I found making bolts with matching nuts and washers are fascinating to play with, and teaches how screws work.
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