I have had this problem on a several vans now…
There are two solutions:
- STOP using your front Window Stay – That Front Window is HEAVY – to HEAVY for the lightwight cheap pine frame that the manufacturer used.
- Remove the “frame trim”, repair/ replace the wood, fit Steel repair plates to re-enforce the frame, refit the trim.
I’ve used both methods, but method 1 is easier!
I have photos showing method 2 if anyone is really interested.