Advice on "Extra Parts" to Orderr

Hi,

We are ordering a J channel and some other long parts for shippment to Alabama. We've been ordering various extras to have on-hand just because.

Will you recommend some additional parts to add into the order, please? We're building a -10, working on the top skins of the left wing.

TIA!
Mike

You might consider ordering extra of the aluminum tubing that is used for the control linkages for ailerons and elevator. It would only be needed in case the original tubing gets cut too short, by mistake. The tubing is not too expensive, but shipping is. I had this in mind when cutting the tubing for my control linkages and was super cautious when doing so and it turned out alright.
I did order a few lengths of extra angle (3/4 and 1") and that came in handy.
Buying extra "just in case" is a bit like insurance... how much is reasonable?!