This example clearly showed a good detailed description of the mechanism of the ring expansion. I noticed a methyl shift was required to make the carbocation relocate to another carbon, so the bond could expand and attack it to form a new bond. I got a little confused on how you formed the double bond toward the end, but I think its because you added a proton to the bond correct? Thanks for sharing this example with us! It was really helpful for me because I was lost on the ring expansion part before, but now I firmly understand it.
I'm glad that you did an example of a ring expansion as your problem. I still have issues with these and you wrote yours out so clearly that it is easy to see and comprehend. Even though we are moving on to Organic 2 it is still good to go back and review basic concepts that we struggled with and yours definitely helped me do this!