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I can not remove the aperture or rear port cover or loosen the Declination/Altitude scale knob. How do I loosen it?

April 26, 2017altitude aperture cover Declination Knob loosen port rear remove scale

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I can not remove the aperture or rear port cover or loosen the Declination/Altitude scale knob. How do I loosen it?

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A. I have successfully used rubber jar-lid removers to grip the cover to unscrew them. It is also been reported that putting an ice bag on the cover for about 30 seconds will also work. And from Dr. Clay Sherrod for the aperture cover: “Very gently grasp the dust cover edge in your left hand with only three fingers; do not put any pressure on it at all; take your right hand with a rubber glove on it and very tightly hold the OTA to keep it from slipping; without pushing or twisting, merely turn with those three fingers…it will pop loose quickly if you keep trying.