Something similar happened to me with this figure (pic not mine), Since this thing has interchangeable arms. The peg that sustains the arm with the lance broke off and the arm fell with the peg still inside. The kicker: the male peg was on the main body and the female hole was in the arm, so the peg itself took off with the arm part and was impossible to remove.
I tried many things to salvage the figure, but since the longass flag-like sleeve things are solid plastic the figure couldn't sustain itself for long on just superglue, and the plastic was much softer around the breaking points, and had tons of plastic frills so I couldn't produce a peg with a metal clip and a small drill. I even tried to superglue the arm with putty and 2-part epoxy but the arm always eventually came in a few weeks off due to its weigh.
Had to make drastic desicion to discard the sleeved arms in order to salvage the figure. A shame, as I really liked the lance.