I bought a bathtub drain removal tool. It broke the metal cross piece in the 35 year old drain. Was told to cut a 2x4 to the correct angle beat it in and turn it?? Anyone try this? Also can't find a 1.5 inch internal pipe wrench does such a tool exist?

I've never heard of the 2X4 method of extraction. It seems to me that it would just jam the two threads togather making it that much harder to back out.
They make a real skinny tool that accepts a single hack saw blade. The drain is chrome over brass and cut easy. I cut the drain through the lip and down to the brass threads of the tub shoe. I then work a screwdriver under the thread intil I can lever it out. Don't worry too much if you nick into the tub shoe threads with the hacksaw. The seal under the lip holds in the water and you can always double Teflon tape the male rhreads when you reassemble.

"I can't find a 1.5 inch internal pipe wrench does such a tool exist?"

It sure does, but it's not called a "internal pipe wrench", (although that's a very good description.) They are called "Easy-Out" and back in the days before copper piping or PVC drainage when we ran galvanized iron for both, if a thread broke off in a fitting that's how we removed it. Just measure the inside diameter of the tub drain and see if a plumbing wholesale house might still carry them. They haven't been used for years now. Good luck, Tom

After reserching the net it would seem that "Easy-Outs" aren't as hard to locate as I thought and they are called internal pipe wrenches. (see image)
If you wish to purchase one I can give you a link. http://www.superiortool.com/photos/s...tool/05212.htm Regards, Tom