I tried but couldn't get it straight.
A new tunnel was cut from 3/32" thick basswood.
I darkened the underside with pencil to better see the curve sanded to fit the BT-52 pilot tube.
Instead of wrapping sandpaper around the BT-52 tube, I wrapped 220 grit around an engine casing.
TIP: When contour sanding - You can get a better fit using a smaller diameter tube or casing.
What's left of the pencil lets you see how much has been sanded. The picture on the left shows a little more work is needed.
On the right is a good fit, probably as good as it'll get.
The lower 2" tube, shroud and upper tube were slid together for a shot of filler/primer, no glue yet.
In the picture, the upper tube was pushed up to show the unpainted gluing area.
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