I'll add this to the discussion since there have been a few recent post about fasteners that were stuck. I have not used this product nor am I affiliated with it... Too expensive for a one time use but for those "in the trade" it could be handy to have something like this on a field service truck.
Mini-Ductor® Venom® HP (MDV-787)
The Mini-Ductor® Venom® HP is the fourth generation Mini-Ductor in the legendary handheld Mini-induction® heater line! Mini-Ductor® Venom® HP: The Most Powerful Mini-Ductor® Yet The Mini-Ductor® Venom® HP is the highest-powered induction heater available operating at 1800 watts. This allows...
www.theinductor.com
