An electric steamer delivers more consistent steam. Put a T in the line to relieve the pressure if necessary.

Maybe try dry heat like with foam cutting rods. That way even if you miss the gap it still heats the block enough to soften the glue. Plus no waiting for everything to dry out...B^ )

Thanks for the videos, they're the only ones I can find with a similar guitar as me. I'm working on '59 Kay "Western Rhythm" Guitar with a steel reinforced neck. I've got the neck pretty loose with just a hair dryer so far. Heard a few of the same pop sounds you did (also hoping it's glue). Did you use the steam rig for that other neck you showed briefly at the end? Edit: Just gave it another try using an iron this time, and it's now off!! A bit of wood stayed with the body of the guitar instead of with the dovetail, but it doesn't seem like a huge deal. Maybe the steam method would have avoided that. Either way, my project continues!

The foam cutting rods seem to be the new standard to use. Steam is definitely the old fashioned method. The Kay is obviously a good choice for learning how to do guitar repair. How much did it cost you at Goodwill?