Mapp Gas!! Get it, now.. do it! (Shane's way of saying DO IT!) lol
Lets you heat up -any- stuck bolt to red hot in just a few seconds, and isnt too spendy.. I dont think I used up more then 1/20th of the tank of mapp gas when I did my own 3" BL.. and it has a ton of other uses as well.. it costs around.. $35 if I remember correctly.