In two sessions through the day, started riveting the LH main spar. Figured I would get the two spars to the same level of completion (all the -6 rivets in the outboard spar) before moving on to the different length rivets in the spar root. Did 71 rivets in 1 hour in the first session. Used rivet tape on the heads - this leaves the heads looking like they haven't been touched. Went to the local used tool shop for a few more rivet sets to get under the spar cap. Did some more riveting in the afternoon. Got about 130 rivets done on the LH spar.