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For years this spout has been in my late Nana's bathroom. For years, the diverter was always jammed in shower shower position, leaving it unable to run just bath water. Although, as the shower is on water still continued to spray out of the spout and makes a horrible screeching sound as well. I do not know who installed this, why or when. But it needs to go. I've been trying for the past 3 hours to get the darn thing off. Looked at numerous how to's but nothing seems to work for this one. I do not know what the white plug that was screwed under the spout was for. Even with it out the diverter is still jammed. I can get the spout to spin completely around but it will not unscrew nor do I see any type of set screw. Used a flashlight to look side to side thru the opening a set screw may be but no sign of one.
ANY HELP from the pros????

 

This covers all the types I've ever come across: https://www.plumbingsupply.com/info-tubspouts.html

If it's a slip on, the setscrew is probably on the bottom near the wall, accessed through that little opening.

The white plug probably was to allow a hand shower to be added.

 

Turns out there is a set screw. It was located on top of the spout, directly opposite of where the access hole was. I only found it because in my attempt to grab hold of the plastic "flange"? while turning the spout, the metal on the spout cracked. So I took my needle nose pliers and continued to peel the metal back, like a can of sardines, until it revealed the set screw. Once I removed the set screw the spout screwed right off.
So now I am off to purchase a new spout! I am still curious as to what that plug on the bottom of the spout was for.

 

Likely someone over tightened it and the threaded adapter slipped on the pipe and ended up on top.