Push it back in, put a tie rap or rope around it till you can fix it.
It is spring loaded, just push. It may help to pull the elbows together to get it started.
The D shaped hole in the motor coupling has failed. Do a search, there are some work around fixes.
04 Horizon QD, 12 Ford Flex, Excalibar, Brakemaster, Winter Texan, RVin! since 1974
Norm, Donna & Tinker Kat(RIP) 01 Z3
Life is a Timed Event, you only get One Go Around!