First, welcome. Is this the 1hp Colt or the newer slightly larger one.
Meanwhile use a small amount of alcohol or mineral spirits to clean the inside of the base, and the outside of the router. Let it dry thoroughly before using. After cleaning, there is a small nut just beneath the flip handle on my colt, that you can tighten. But don't over-do it. I think its the same on all the colt models.
Are you certain that the base mount slipped, or was it the bit that moved? The bit slipping is a much more likely issue, and means that you need to make sure the collet is a bit tighter. It doesn't take much because the collet is a very precise device. The difference between tight and loose is just a few thousandths of an inch. Also check make sure the bit's shank is clean as well.
Meanwhile use a small amount of alcohol or mineral spirits to clean the inside of the base, and the outside of the router. Let it dry thoroughly before using. After cleaning, there is a small nut just beneath the flip handle on my colt, that you can tighten. But don't over-do it. I think its the same on all the colt models.
Are you certain that the base mount slipped, or was it the bit that moved? The bit slipping is a much more likely issue, and means that you need to make sure the collet is a bit tighter. It doesn't take much because the collet is a very precise device. The difference between tight and loose is just a few thousandths of an inch. Also check make sure the bit's shank is clean as well.