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Looks like you have a very thin cylinder there - you'll need to select the corresponding vertices from both sides and snap them together - Vertex > Snap Together or CTRL-N. Something that small, it may be a bit difficult to select individual vertices, so you'll need to use the wireframe views and zoom in real close.
Be careful about your poly count too - it's hard to tell how many vertices you have in each section there but it looks like quite a lot. You can check that by selecting your whole mesh and doing Tools > SelPolyCount
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