Very good, shallow (6cm) and unobtrusive fixture. The removal of the locking device of the projector can still be easily removed from the ceiling. Also fits Acer 3-point support, to simply remove strut. Me only bothered that the attachment was not completely "rigid", ie you can easily lift up the projector. Have made two small black wooden wedges to remedy this problem, which I now einklemme between the upper and lower part of the bracket. Now everything is rock solid, nothing wobbles more even if you accidentally touch the projector (with low ceiling height possible). Therefore "sake" star deduction.
