Does the cone open up to wrap it around the pole or does it have to be slipped on over the top or bottom?

It opens up to wrap around the pole. I was even able to wrap it around two poles that are side by side, giving me more hooks to hang bird feeders that are protected by the baffle.

The black coupler was not included when this was shipped to me. who do i contact to have this shipped? the manufacturer contact info was incorrect.

the # amazon gives you is incorrect 800-842-9825 is the # to call

I have a 2 inch pole. Can the top be cut to enlarge it so it would work on my pole?

Hi, Gary. When the baffle is closed, the opening at the top measures 1.5 inches. The support (which clamps to the pole and holds the baffle up) is not big enough to fit securely on a 2" pole. You might check with the manufacturer to see if they offer a different sized baffle set up. I hope this helps.

What is the max pole diameter your product will work for? Mine is maybe closer to 1 5/8"/

One and five-eighths is the exact diameter of the hole in the baffle, but you would have to be able to slide it on from the top or bottom of the pole after the baffle has already been hooked together. I say this because one side curves around on the top and the curves around on the bottom and you hook the two curved parts together like if you curved your fingers on both hands and then hooked your hands together. While squeezing the baffle in order to hook the two sides, the hole would actually become smaller than 1 5/8 during the squeezing process until they hook together and then will snap back so that the hole is again 1 5/8. So if you're pole is already in the ground and your bird feeder is attached to the pole in such a manner that it can't be removed or the pole can't be separated, you won't be able to attach this baffle. I don't know if I explained this very well, but hopefully, you get the idea.