Repair Battery Posts? UPDATE-Photos

Update at end (5 Sep post)

I have over torqued the threaded bolts on a couple of posts so they have come out loose. The bolts are simply set upside down with the head covered in the lead of the post.

So how to get them stuck back in? Can I use a propane blowtorch on the lead and then use pliers and hammer (whatever) to squeeze the bolt back in the lead or will that blow- torching heat go down into the battery and do something bad? Or what?

Thanks.