The product has a good design and feel and comes with the tools needed to adjust the depth of cut and change or rotate the bits. I'll see what kind of earbuds he used and have a spare set on hand for later. The air intake appears to be straight threaded, unfortunately I don't have straight threaded air fittings at home and I don't recall ever having one for my type of fitting. I was able to use NPT and it doesn't leak, but I should have been a little more prepared. Overall I like the tool and I would recommend it to my friends.
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