I have been asked about the wood blocks in this picture. On this model, I had a brain fart when I cut the dowels which were already attached to the ring by the time I realized it. I simply made shims to fix the problem. If you cut your dowels correctly the first time, you will not need these plates.[
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As you can probably see, I neglected to account for the step back to the larger fire wall plate.
Measure twice, cut once. In this case, it would have taken a third time, at least.[&o]