Mine just twist/push out. Kind of a pain to get them back in, but I've found that wrapping a piece of string around one end twice, then using that to pull it through seems to help alot. Make sure you moisten it with something before you try to put it back in though. I use spit, but even plain water should help some.
2006 Rytera Bullet X 60#---2008 Moab 70#
2008/12 Firecat 60#--- 2010 Warthog 70#
2010/2012 Alien X 65# 2011 Onzas 60 & 70#
2009 Warthog 70#---2009 Firehawk 70#
2010 Strother SR-71 65# & 2012 Strother Rush 65#
I hunt, therefore I eat. lol