A syringe and needle can be used to inject EA-40 into cracks/gaps if you would rather use that instead of CA. It is very hard to press out of the syringe, but it can be done with the proper amount of time and patience. Slow, steady pressure works better than pushing as hard as you can.
If a needle won't fit, you can use a tongue depressor to pack EA-40 into the gap as well. Start on one side of the gap and work your way across. Put a bit of adhesive on the sick, press it down into the crack, then slide the stick off the gap in a wiping motion (don't pick the stick up off the gap, it will pull the adhesive back out). You should see adhesive squishing out of the gap on the sides of the stick if your doing it right. Pack the whole thing full and then clamp snug, not tight. Your aim here is to bond the structure more than it is to close the gap, don't starve it. Let me know if you have any questions!