Yes, a lot! There is that imbus(hex) slot screw behind the mirror where I had to adjust the focus. Actually I had to add a thin tape over the screw to have the correct setting.
I have laser cutter, so I used that.I glued two plexi rings to the base, those rings hold two screw nuts. The two fixing screws go there through the panel. You can find this on one of the photos.I hope this helpsThxZoltan
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