the manual for our I-Pro 8935/8953 Fuksnr ptojrvyot says to "slide the knob of a lamp cover lock as shown in figure" in order to remove lamp cover and remove lamp. Our projector doesn't have a "knob", just a small rectangular hole on the of the projector. Is this what it is talking about? Nothing "slides", therefore we can't remove the lamp cover to change the lamp. Can anyone help? Saundra Quiring jquiring@cox.net