Having two identical hides helps them feel secure. If you have two different ones, then the snake could favor the security of one over the other - but the other has the proper temperature the snake wants at that time. They end up sacrificing something in the end - and that can stress them out immensely. I second the soldering iron - that's what I did with my dog bowls. 1$ bowls at walmart or the dollar store - i cant recall. and a 15$ cheap soldering iron at home depot. And yes - do it outside - such a bad smell.

And even in a week, harmful bacteria can multiply exponentially. And making a new hide every week can be really annoying. Make hides once that will last a while. When they outgrow it - make a bigger one. You should be able to get through all of a snakes life with probably 4 different size hides (this is based on my experience with my snakes, others may have different views though).