Am I missing something?
Is there suppose to be another tambour door guide on the bottom of the small cupboard door under the sink? See the picture below. There are two every where else but not here.
I've cut the tambour for the 3 door in the sink base and I've had to practically had to take the darn thing all apart to get the new ones in. I can see why people give up trying to install them under the sink. Without taking the counter top entirely off I really don't see how you would do it, all those hidden rivets!
The tambour really does match much better than it shows in the picture.