Nope. The best way to incorporate a hex head is to drill an undersized pilot hole in the tool end. Then press in a length of hex bar stock that has a bevel ground onto the end so it won't "shave" the Delrin as it is forced in with a press. The Delrin will "flow" enough and lock the hex in place.

Note I did not incorporate the above on the tool I made as I considered a hex wrench to be too "fiddly" to reverse direction. In use, there are times when the eccentric tool wants to be moved back and forth and the ratchet wrench is near hopeless for this. I (of course!) think my design with the three cross holes is functionally better. The 1/2" stainless steel handle rod is bent at it's center, the bend is such that it splits the angle between the three cross holes that provide 6 handle positions - so with the bent handle there are 12 discrete firm positions, the bend also acts as a handle "stop" when inserting the handle, as designed, it works flawlessly (and I'm not one known for leaving well enough alone - sigh .