If you break an axle and have no spare you could try this: break the boot band on the inboard t-case boot end, and pull the tripod (and axle) out of the bell, while leaving the bell intact and in-place, it will stay in place and act as a seal, and would not cause any additional damage. The only thing that needs to be left behind is the bell. Of course, you would still have to be prepared with tools to loosen the knuckle bottom, and to pull the axle parts and the shaft out of the hub. You could stick a rag or something into the hole left from the absence of the outer axle and hub.