the pins would have to be cut.
they're held in the guides by clips that look like washers with 4 fingers sticking in twoards the middle.
another common thing to look out for is that the guides on the rail are bent or mishapen.
check out http://www.ifsja.org
they have a couple write ups on troubleshooting problems with the tailgate and how to take it apart.
if you have any other specific questions email me, email@example.com
I might be able to anwser, I just recently replace most of the inside of the tailgate on my 89 GW.