I can see where you are coming from Don, but the idea of the knob is to push against a bushing and bring together the jaws of the quick release clamp. The threaded rod on which the knob rides does not rotate. Hence the knob should not be glued in place, as it is meant to rotate. It basically acts as a nut.
I think the way the knob should work is that one end is drilled out, and then once the knob in on the threaded rod, a lock nut is placed on the end, to prevent it calling off. The knob is fairly long, and has a plastic cap to hide the lock nut from view. You can see that from the brochure and manual in the photos.
I could bore out one end of the non-captive knob seen in the photo, assuming I had the tools. But I am currently using a wing nut in place of the locking knob and it works quite well. The only problem is that it is not captive. A 6mm locking nut does not work as it is too wide. I think a piece of plastic tubing whose inside diameter is a bit less than the outside diameter of the thread would act as a good locking nut.
BTW yes I have a new toy!
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