Yes Dan, you are quite correct.
The comfort kit uses an allen bolt that goes right through the whole assembly and makes no use of the taper socket in the original steering arm.
If you are using an Hex socket screw you can then opt to use the equivalent of A102 aircraft spec bolts in ultra high tensile steel. A102 is a hex head UNC bolt and I forget what the equivalent spec metric hex socket head reference is (it might be DIN-912) but I use Unbrako series 1960 Alloy steel hex socket screws on my 911 RSR rally car. These are extremely fatigue resistant and it is standard practice to use these for example on wishbone bolts on competition cars, where they carry high shear loads.
You used to have to buy these from aircraft fixings suppliers with lots of paperwork and they were very expensive due to all the tracking paperwork. You can now buy them tracking free for non-aviation use, which makes them much cheaper, from companies like socketscrews.co.uk
