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In my RC neither mirror is fixed, both mirrors have adjustment screws like a newt. As was pointed out the problem arises from the optical design of the mirrors compared to a newt. RC owners can easily get into a cycle of adjustment that 'chases' collimation. There are tools and techniques that make it easier but it can not be as simple as a newt. The refusal to accept the need for special tools is often the cause of building frustration by the novice owner. Sure you can collimate an RC with a Cheshire but you have to know exactly what your seeing and how the surfaces inter-relate. Taking a newt collimation skills set and assumptions into RC can result in frustration. I admit i was a slow learner.
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