Hi,

I am also assembling this plane and I just went through this step the other day. For what it's worth... I always replace the ply wing joiners with a piece of solid maple that I cut to size with my table saw. I have had wings fold at the joint in the past and noticed that the ply wing joiner had broken at that point - I am sure that a great many folks probably have not had a problem with this (maybe I fly too hard). I took notice of how sloppy the fit of the supplied J3 joiner is and I made the new one a bit tighter. I agree with the other responses that using alot of epoxy will allow you to use the supplied "sloppy" joiner. Good Luck!

Steve