I have a big no soliciting sign on my door, when sales people knock anyway I make it a point to waste as much of their time as I can and not buy anything.
I have a big no soliciting sign on my door, when sales people knock anyway I make it a point to waste as much of their time as I can and not buy anything.
You can just use a tiny stone that fits inside the cover to push the valve down enough.
Tiny ball bearing and a dab of super glue also works great