ORIGINAL: Campgems
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As I read his opening question, and his follow on, he is having trouble fitting the parts and as a result, there are some air gaps between the center of the beam and the spars. This would either be caused by a work table that is not flat, or the beam center not being cut straight.
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You are correct, I had to reread the original post again...
And to answer it, I'd probably advise.. Abandon trying to make the web pieces work.. bust 'em out, make new ones, gluing onto either the front or the rear of the spars (per Mike's drawings) and call it good enough...
The wing will be much stronger because of the glue joint and surface area... Added weight will be.. oh what.. a couple ounces??? Trying to fill in all the gaps with glue or epoxy would've added that.. easy..
The "built up I-Beam" mentioned in other posts is OK, but the side shear webbing as shown in Mike's posts is even stronger, with very, very little weight gain. A piece of 1/16, or 3/32 balsa is a couple bucks.. A couple hours time...
Do it the right way.. it'll be worth the effort.
NOW.. having said all that... if there's consistently a gap between the spars and the webs.. There's probably a reason.. Like the spars not sitting "deep enough" into the ribs, because there may have been cutting waste still on the bottom of the spar saddle of the rib... Thus not allowing the spar to sit deep enough..