To make sure the splined lever could actually squeeze tight on the shaft, we removed 4 teeth on each side of the gap. The stock lever has this as well, never noticed this before..

 
 

We decided to make a teardrop shaped cover to hide the end of the shaft, it is only welded on one side of the squeeze gap, so that stil works

 
 
 

We did not want to see the end of the thread of the pinchbolt, so first Aad machined a brass piece that fits in the hole, then welded the end of the hole shut. The weld does not stick to the brass so now we have a blind thread and a much cleaner appearance