I have used this on several sizes of L type copper coils and it has worked very well. Just take your time and follow these simple steps: 1. Don't rush to cut the pipe while the copper is annealing, you will have to rotate the cutter more often while applying less force to the cutting wheel than you would with a hard pipe. 2. You MUST use a deburring tool to remove the chamfer on the edge of the fresh cut. You won't get a good torch without one of these $10 tools https://www.amazon.com/Reed-Tool-DEB3-Deburring/dp/B003NU3DSA3. Insert the tubing into the instrument so that it protrudes approximately 3/32 inch from the instrument. I use a 5 cent nickel and make sure the tube is just under the height of the nickel. 4. Alternately tighten both screws to ensure they are secure. 5. Attach a press to the tool and rotate the handle down until you feel greater resistance. This depends on the type and size of the coil. This may take some practice. Apply a small amount of pipe compound or pipe compound to the frosted surface of the flare and lubricating oil to the threads to help the fitting rotate and create a tight seal. I only gave four stars because the two halves of the instrument didn't always fit together. I actually give it 4.5 stars because it's a great tool at this price point.
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