>. You're supposed to use stop nuts on the back of the spar but good >luck keeping resin out of them. ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Purchase a hand full of nylon bolts the size of the anchor nuts (#8 or #10) and thread them into the anchor nuts to keep there resin out. When cured, remove the nylon bolts. I used that process in several places while building. If using wax, I'd try heating the wax a bit to soften but not so hot as to soften the resin on the back side. Run the reamer through the warm wax to remove. If you break one of the nylon bolt it should be easy to drill out with an undersized bit. As always, your results may vary.......... Larry Flesner