I like using a glue stick on shrouds. It's not as wet as liquid glue and can make for a cleaner joint.
I don't apply glue to the glue tab. Instead I apply glue to the shroud edge and press the tab into the shroud.
Applying glue to the shroud (and not the tab) leaves the exposed tab clean for the next step
More glue stick was wiped onto the inside of the shroud end and the glue tab pressed into the glue.
I use two clean dowels to press and seat the seam. Set a larger dowel under the joint and roll another dowel over the top. This is much quicker than holding the tab until the glue dries.
After a test fit down the BT-20 engine mount tube I found the small end to be too tight.
To widen the small end it was sanded on a block. The second nozzle shroud was set inside the shroud to be sanded for support.
Sand a little and check the fit. Repeat until you get a good friction fit over the tube.
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