I needed a MAPP gas torch and freeze spray to get mine off the first time after I bought it. Zero anti-seize on the threads (I also noticed boogered up wheel pins, which all had to be replaced...$5 each...ouch).
I've since moved over to stainless spinners, and use loctite silver anti-seize (I like the
Stick #37617 stuff as it's no mess).
Never a problem since.
Make sure you are using a heavy lead hammer (I got a
'mother thumper' from Cobra Valley) and tap/turn/tap/turn as mentioned above. Apply heat/cold if it's really stuck.
You might also try some PB Blaster penetrating
oil....it's just about the best stuff I've found.
Getting them off the first time is always hard....now you know why anti-seize is so important!
