Continued with prep work on the left elevator including finishing the match drilling for the elevator skin and associated parts. Deburred and edge finished as many of the parts as I could while I wait on the new parts to arrive. I got a little carried away on the instruction to countersink the top of the flange for the trim tab cutout spar. The plans have you dimple the side that will just have the skin sitting on it (easy enough) but then they have you countersink the other side of the spar which will take the hinge bracket that holds the trim tab in place. Well........ I haven't used a countersink much as of late and I got a little carried away with it trying to make sure it would be deep enough to accept whatever sits above it. Before I knew it I had enlarged the holes from #40 to about #30 and on three of them, I let the countersink bit wobble apparently and elongated the holes. No worries I figured, I would just enlarge the #40 holes to #30 and make the corresponding changes to the skin in that area as well. Then I stared measuring edge distances for the three holes that I really messed up. I had already enlarged them to #21 size 5/32 figuring I would just use a larger rivet. However as I measured with the calipers I think I convinced myself that this actually wasn't a good idea after all. So I'll order another one. If I'm lucky since Vans didn't process my order from Friday yet, I can just have it added to that order. Oh well, I still have about 8 parts I can paint tomorrow to still be able to make some progress before I have to leave on a work trip. Lesson learned! Go easy on the #40 countersinking!!!! Doh!