George, I must be blind or something. I just noticed that I need 2 of those square nuts that the knobs thread into on the steel fixing units. This is my fault, I should have checked before asking for the hardware I need to convert the clamps. I will send you some money to cover the shipping. It should have only taken one shipment. My fault.
For future reference, to convert the new aluminum fixing units on a pair of conical quick adjust clamps to the old steel version, the following parts are required.
2 steel fixing units
4 long bolts
4 nuts for those bolts
2 square nuts for the attaching knobs
The attaching knobs are a bit longer on the aluminum fixing units than the old steel units, but they still work fine.
These major changes to the system are frustrating at times, but as long as it is to make the units better, I guess it is worth it.
Sorry for the over-sight.