ORIGINAL: grinder-RCU
..... How do i get JB weld to soften up so i can take out some toe in.
A small brick of C-4 explosives??

Sorry, not trying to make light of your situation but I don't know that there is any way to soften JB Weld once it has set. At least no way that I've ever found. The closest I've come is removing it and that required a lot of work with a dremel and a grinding wheel.
Sorry that I don't have better news
Ken