Below is a picture of the inside of a projection TV. I put a green circle around what appears to be a mechanical focusing adjustment lever. What I don't understand is this: I can easily move the lever, and see that the large lens moves in and out as I move the lever. But, in my mind, for such a critical adjustment as focusing, I would think the focusing adjustment would be locked down with a locknut and wax, to prevent vibration from altering the adjustment. Can someone explain about this?
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