How To Shorten Blinds. So open the clips first and release all the vanes one by one. Re-insert the bottom rail in between the ladder cords at your new desired height.
2 Measure the length from the outside edge of each bracket. Next rotate your slats horizontally. Next slide the ladder plugs back onto the lift cord and secure with knots at the end of each cord.
There should be two or three caps which can be twisted off.
To leave enough ladder string to tie your bottom rail back on cut your ladder strings just below the top-most rung. Next rotate your slats horizontally. Remove the plugs located on the bottom side of the bottom rail to release the string ladders and the knotted lift cord. Undo the knot in the lift cord and pull up the lift cord enough to release the slats you need to remove.