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There is an easy way to do a quick check on it. The setting circles should be the first thing to bind up.
Release the thumbscrews on the setting circles and with the axis cluch released (Without a scope mounted of course) spin the setting circle, it should move freely. Then try again with the clutch tightened, if the setting circle has gone tight with the clutch done up it is fouling on the fixed part of the axis.
I got maybe 4 years of use out of mine before it became an issue, but it would depend on how tightly the clutches are done up, the tighter you do them (I have heard of people breaking the RA clutch lever!) the more quickly the discs will compress.
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