This is going to seem like a pretty stupid question, but I've been keeping my eye out for an answer and haven't seen one. Say you have a straight shot stove pipe, coming out of a stove's top exit, going directly to the ceiling box. It's single wall pipe, and the question is - how do you get it in and out of place? With double wall you would have a telescopic piece and it would be easy. I've heard about "inspection wrap" pieces, but never seen one for sale. Is that the only solution?