I purchase this mount after read the review for use this mount with a Epson 8350 . I take the advice of other in order to locate the balance point of the mount . also , like other , I be only able to use 3 of the 5 mount hole . however , I be able to mount the projector and it work very well . it take a little adjust to get it level and solid but I be able to do it . I do want to use all 5 mount as I want to be sure the projector be securely hold . I find the Atdec website and send a message to customer service ask how I would go about purchase two additional long extension . I be very pleasantly surprise when the customer service representative reply that he would send they to I no charge if I would provide my address . now that be outstanding customer service !!!! highly recommend this mount !