The issue I have found with those is the area where they allow the control surface to go through (there is a flat with no threads) is too short for most servo arms. This causes it to grab and these need to be able to rotate. If not, you will get binding. I like the ones with the push on black lock. Always had luck with them, but they have a short life span if you take them on and off a lot. Just my $0.02.