Created in the early 1970s the 16.75-inch long spindle tube is not as useful as it once was and I find it is usually just in the way.
We trimmed 3 inches off the length Both are available (long tube not available in the Radius air)
If you do have flutes to sharpen longer than 6-1/2 just let us know. we now make the tubes interchangeable and the bushing is now anti-fowling Astm B16 Brass and is replaceable.