Would look ugly but perhaps two or three of those weighted draft or breeze blockers/dodgers that one lays at the bottom of drafty doors would keep him from falling into the space. The weighted nature of them should hold them securely in place.
__________________  Jeanie and Tibbe One must do the best one can. You may get some marks for a very imperfect answer: you will certainly get none for leaving the question alone. C. S. Lewis |