I'm sorry to post this here, its really here nor there about K5's but you guys always have some good ideas when it comes to fabbing stuff. Here's the deal: I'm currently in engineering and am now in the process of building a small steam condensor to test the effect of steam velocity on the convective heat transfer coefficient. Anyways the the problem is I already have all the copper(and it was mighty expensive!!!) so I'd like to use what I have already. I have 3/8" copper soft line and 2" copper hardline. The condenser calls for the 3/8" copper line to be coiled inside the 2" about 15times.... I've been staring at the stuff and its not as soft as I was hoping. I'm really worried I'm going to kind the crap out of it and have to buy more stuff. I was considering a few ideas: 1) A small pipe bending tool similar to a brake line too.... Do they have these in a 1" radius?! 2) Annealing - can I anneal the copper so its softer and easier to work or will this just make it kink more? Any good methods to anneal? 3) external spring - some kind of tool you slip over the copper to prevent the kinking... anyone have any info on these? Anyways, I'm just wondering if this is possible or do I have to go buy 1/4" copper and change all my adaptars etc? Thanks in advance for any suggestions.