This accessory is for the Heller Lansen kit. The part is a replacement pitot tube.
The Kit
You get one finely done brass part in a plastic envelope, which is inside another plastic envelope. Good plan, since losing parts of this size would be a disaster, not to mention impossible to find.
I liked the instruction sheet, it was simple and showed you exactly where to put the pitot.
Assembly
I cut the remains of the old pitot off and drilled a hole in the wing where the old tube was.
I painted the brass part with Testors Aluminum Metalizer.
I put a bit of gel-type CA on the pitot and inserted it in the hole in the wing. I had enough time before the super glue set up to insure that the pitot was horizontal and straight, after which the project was finished.