The Tapered Deep Hollowing System was designed by Mark St.Leger and is manufactured by Mike Hunter. The components to this new system are two boring bar choices (listed below) and a three-tool cutter package. a 16” long, 1” diameter boring bar with an adapter size of ¾” at one end and a 3/8” tool receptacle with 4 grub screws at the other end. a 12” long, ¾” diameter boring bar with a 3/8” tool receptacle again with 4 grub screws. The reasoning behind having four grub screws is simple: if two get messed up, there are two more to take their place. It is actually a good practice to tighten all four grub screws. There is a lot of torque at the tool tip at 17” of depth (someone aggressive might just spin the tool with only two tightened).
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