These things are delicate

It broke off at a weak spot while cleaning the board a bit too vigorously. The reason for the weakness is that the brass tube was compressed in one spot (around its circumference) to keep the steel tip from slipping out. In an ideal world these pogo-pins should be mounted in such a way that the weak spot doesn't see and sideways force. Adding a sleeve might be advisable, or putting the whole thing into a suitable bore. I added a blog of solder.