Dale,I think some are confused about what "cap screws" means.
No question about it as even a little wiggle can really mess up your groups. ...Wondered if a little wiggle would happen causing groups to open up.
Well, looks like I missed it again. Don't run into this problem, very often and the last time I can remember, It was just the elevation adjusting post that was effected. It was on a cheap scope that I was helping a friend with. I knew that it was not an ideal and in the end, it did effect the point of aim. I think that he is still living with it, as is. Normally you will have this happen when you have exceeded the travel range of the adjustment. ......My scope zero settings didn't move on the scope, the caps both windage & elevation were both loose but in position