Binoviewing view merging tip

This is probably obvious to most of those who binoview, but I realized
something that helped me alot the other night, so I'll pass it along.
Merging the image is harder for some people than others, and has been
hard for me relatively few times. It is common practice for met to
switch around to different ep pairs as i obsessively pursue the
perfect view.
at one point i couldnt merge the image at relatively high power.
Bottom line, i had casually left the ep tightening rings rather loose
to facilitate ep swapping, but this can and did cause collimation
problems at high power.
once i tightened up the ep clamps, the merging problem vanished. fwiw
bob hertel