Top Sash

Thanks for your patience during this busy season. Hm, I'm extremely unfamiliar with this top sash guide; I don't think I've ever seen anything quite like it. I have an idea, though. Take a look at our 18-171. This top sash guide is 5/8" wide, but it has a taller top than yours. There's actually another top sash guide like yours, and what we recommend customers do is to simply cut the top of the 18-171 down to fit under the top lip of the sash. This might work for you also; just go over the dimensions and let me know what you think.