I have several 1-1/2 X 2-1/2 X 1 inch blocks. I open the window and put the 1 inch side of the block the screen and let the window top frame drop down on the block. Depending on which side of the block is up, I can have the window open 1-1/2 or 2-1/2 inches. I also use a block for the passenger side window when I want it open a little.
__________________
2017 Leisure Travel Vans Unity CB
2013 Honda CR-V
|