Makita SCM Adjustment

When I set my Makita LS1013 SCM there is a little play when the saw is placed in a positive stop such as a right angle cut before securing it by tightening the long knob at the front. In other words, for a 90 degree cut, it can be right on the first time, I loosen the knob and can push it slightly one way or the other, tighten it again and it is no longer a right angle. I can not find anything in the manual for adjusting this and I don't know if this is a new problem or has always been the case. Do others have this problem and can it be fixed?
With thanks,
Glen Duff
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