Today I fit the right horizontal stab skins to the horizontal stab structure. Up drilled the two holes in the rear spar to #21 size. I also fitted and match drilled the HS-00005 and HS-00006 ribs to the forward and rear spars of the horizontal stabilizer. Thankfully this time, I experienced no problems locating and drilling the HS-00005 and HS-00006 ribs.
After fitting all of the parts together I began match drilling the skins to the structure.