Easily retrieved though. Take off the other grip and blow forcefully into the handlebar. You should have a catcher on the other end though, as the nut will fly out of the bars pretty fast.I've never hear of such a problem. The usual problem with bar end weights is with taking the screws all the way out instead of just loosening it and wiggling the weight assembly out. That renders the expander and nut inside the bar inaccessible so the screw can't be tightened. As long as the screw can be tightened though, there should not be a problem.