Because the projector beam was low and it's a thight fit. The right beam (LHD) got stuck on the glass. I had to lower the outer joint to get it right. Be aware the line in this picture is way too low! I took just about 1 or 2 mm off !
The projector can be mounted with a thick or a small silicon ring between projector and reflecor. Advise use the small one; my projectors just touch the glass at optimal hieght settings. you'd better have more space to adjust the lights!