Great idea and good to see it works. My solution was just to train the significant other to tuck in the passenger side while i did the drivers side haha.
I will have to try this one. Sounds easier than slotting each side in.Thanks - I'll have to look into this for my 987.2. My temporary solution is to reach up and push the top of the rear glass up/out from the inside as I raise the top. That seems to work to pull the sides in for proper closure.
I'll have to look more closely to see which part you are modifying, and what it looks like on my car...