$17.50 ShopSmith project ™mandrel
$24.98 with 2 stub drill bits: 5/16″ and 11/32″ $25.70 value
$28.98 with 2 stub drill bits and 3/8″ tap $30.95 value
Shopsmith mandrel has a 3/8″ x 16 tpi threaded stud with the unique ™tapping flute making it the most efficient mandrel on the market. It also works with other projects: ice cream scoops, shaving brushes, pizza cutters, etc. It has a black oxide coating to prevent rust. The 13/16″ diameter collar is the same size as stopper tops.
Mandrels come with a thread-protector cap and 2 nylon washers to be used as a spacer to help keep some wood from locking on too tight when you are turning your project. *tip: if the wood does get a death grip and you can’t get the project off the mandrel, put the whole thing in the freezer for 10 – 15 minutes and it will unthread once the metal shrinks.
The shorter stub drill bits won’t “wander” if they hit a tight wood grain. The 5/16″ is the standard size when threading a 3/8″ hole; the 11/32″ is for dense wood, acrylic and resins.
The bottoming tap cuts threads all the way in unlike regular taps that leave about 1/4″ untapped and it makes threading quick and easy.
*Basic bottle stopper turning video (threading the mandrel starts at about 3 min.): Roper Woodturning
Made in Missouri, USA