Hi there Theo,
I agree with the others about this being a nice piece of stock, but I reckon the taper could be improved and make this a great piece of stock and beyond that, give it the potential to become a great bonsai.
Theo corky 01.jpg
The tree as it is now has a pretty nice flare at the base, really nice bark, the first trunk section has some good size about it. The second trunk section has great continuity, it would have been grown out to about 60-75% of the diameter of the trunk below it and as result, taper in the lower half of this tree is very good.
What I think you need to do to is grow the 3rd section of trunk, as indicated by the dotted line in the picture below, until it is around twice it's current diameter.
Theo corky 02.jpg
Then repeat this process for all remaining sections above, grow one out at a time, remember to reduce the length of these segments as the trunk ascends. Doing this would require a trunk chop about 4/5 of the way along the dotted line.
Yes you will lose the top of you tree that you have invested a bit of time in and yes it will take 3 years or more to get back to beginning work on the upper branches and apex. I reckon what you will have after the rebuild, is the foundation of a very good tree.
Cheers,
Mojo
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