Hi John,
When my driver's side window regulator failed, it broke that little plastic piece and then proceeded to foul the cable around the drive capstan. It was a complete write-off. I bought a new regulator from Van Cafe. And while I was at it I installed the GW window switches kit. 
Oh, where did the window regulator fail? Just as I pulled up to the Canadian Customs Officer. He was not amused. 
Mike M

Sent from my iPhone

> On Oct 16, 2016, at 7:42 PM, John Rodgers <jrodgers113@GMAIL.COM> wrote:
> 
> I think these are pretty much the same from one year to the next, but just
> in case - mine is a 1991 Carat.
> 
> The cable guide at the bottom of the window operating unit has come out of
> position. I have three window units, and all three seem to have the same
> problem, so evidently this is a pretty common fault. The top and bottom
> cable guides a plastic of some sort - teflon maybe - and are not worn or
> broken it appears. Just out off position. Problem is, how to get them back
> into their proper slot. The window lift squeezes down on them and there are
> no screws to remove to move the lift so they can be released to put back in
> position. The lift is held by some plastic pieces that cannot be replaced.
> Just wondering if anyone has dealt with this issue before. Rmoval of the
> entire regulator assembly is fairly stright forward. But the cable guide is
> a whole 'nother matter.
> 
> I seek the experience of the Vanagon List members.
> 
> Thanks!
> 
> John