Not sure what plane you are building, but for mine (7) I never used any of those parts. They are from what I have heard, extra pieces vans sends incase you mess up something. Most probably really screw up the trim tab and some fabricate riblets. Personally, I wouldn’t use them for practice. I’d save them and did, to use during building, for fabricating stuff, using as a doubler incase you wallow a rivet hole while drilling the HS spar, etc. But, you could use them as practice if you really wanted to, or use the vans practice kits to mess with.
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