I epoxied the guessets for the left side of the rib. About 4 grams of epoxy used. I use standard office pins (0.7 mm diameter) for holding the guessets in place. After epoxy sets, I remove them. The other side guessets? I remove the rib from the jig and I simply use clamps. So, my ribs do not have any permanent nails. Takes a little longer, but I am quite happy with the result.
