Enjoy having 10 quill feed handle positions at 36° increments, instead of 3 positions at 120° increments! This quill feed handle upgrade is easier and safer to operate, provides comfortable working position, and moves well out of your way when necessary. Here's how it works. Simply remove the quill feed handle and hub that's mounted to the quill feed shaft on your MARK and replace it with the hub adapter. To attach the index handle to the adapter, slip the handle's center hole over the 5/8" shaft of the adapter. The rare earth magnet will engage immediately, pulling the handle indexing pin into one of the 10 holes bored into the adapter. For handle re-positioning, disengage the handle from the adapter and move it to a different position, by simply grasping the silver collar of the index handle (NOT the black handle nor the handle shaft) and pull it straight out and away from the adapter. No fiddling or un-screwing the handle from its hub. The indexing pin and holes have been precision fitted to one another with just enough clearance to allow them to engage and disengage quickly, yet they will not disengage in the event you should accidentally bump the handle. Note: The Quick-Index Quill Feed Handle works on all MARKs. Includes: Standard 5/32" setscrew and 10 precision-bored, evenly spaced circumferential indexing pin holes