Sorry Tech2C, but the original Y_Shaft_Clamp is too fiddly for my big thumbs and so I decided for a remix.
There is enough space in this place to install a larger bracket.
Just insert a M3 nut from above into the slot and a M3x12 screw from the side to pinch the axis.
Be a bit careful with your strength!
Just designed and printed but not yet installed. Please give feedback if something does not work.
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UPDATE 1:
The inner diameter of the original "open frame" design by Tech2C is 8.2mm. This is a bit too tight for my "closed" design. I've added two more clamps with 8.5mm diameter.
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UPDATE 2:
Added clamps for 10mm axes.