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.
Often with resin parts you could try heating (either by soaking in a pot of hot water or using a heat gun) the part so that it becomes pliable, then twist it in opposite direction, then clamping as necessary to hold the part in shape until it cools. Not uncommon to have to do this with resin parts in garage kits and aftermarket resin detail parts -- especially with thin parts.
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