The end of my dipstick fell off

[mortimersnerd]

While installing my shiny new motor mounts I had to bend the dipstick tube a little to get a wrench in place. While bending it back something went "pop" and the tube now rotates freely. What broke? I't's always leaked a little, and there is a generous amount of RTV around it, so I'm not sure there isn't a PO kludge on the inside of the pan.