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The IR mirror and QPD problem is resolved. Skipper reinstalled the mirror and I realigned it and now it seems like it works.
Image:QPD.png The QPD is more (enough) maneuverable inside the limit of ½ cm. The signals are not running crazily all over the place as before. After a short tweaking of x and y axis and the condenser they are easily overlapped at 0 amplitude. The signals look kinda noisy, skipper said, “He will check it up!” So I am moving to the next task now. http://www.evernote.com/pub/pranavrathi1/qpd