I would suggest a drop of loctite blue on the screw threads. This can still be removed by hand tools. The red version needs head applied to remove. HTH

Dan
Country Homes Camper, the Huckleberry Sky

> On Dec 5, 2019, at 7:13 AM, John H. Lauterbach <john@jhl.mgacoxmail.com> wrote:
> 
> 1991 Subie Vanagon GL
> 
> The top screw that hold the latch to the door keeps coming loose allowing the
> latch mechanism to rotate around the bottom screw.  It is not clear from the
> diagrams in Bentley if these screws have nuts behind them or go into tapped
> holes in the door frame.  If they go into holes that are trapped, what is the
> procedure for repairing the threads.
> 
> Thank you very much,
> 
> John