May 24, 2007 ... Using the pre-drilled holes on the (W10-01) Main Spar Web, I pre-drilled the right upper and lower spar caps with a #40 drill bit. To keep from marring the spar caps with the drill chuck, I purchased four each #40 bits, #30, and #21 drill bits, in a 6 inch length. These are available through the Herman's Central tool company website.

June 9, 2007 ... I was able to spend a couple hours in the shop today! So, I disassembled the pre-drilled right wing spar, and deburred everything, then re-assembled everything and updrilled with a #30 bit. I disassembled everything again, deburred, then re-assembled. But this time I re-assembled

the spar parts without the (W10-01) Main Spar Web, and updrilled all of the web parts with a #21 bit in preparation for countersinking the Spar Web Doubler (W10-03).
Notice the yellow arrow in the photo ... To keep my wing mount blocks aligned perfectly with the pre-drilled holes provided by the factory, I installed a 10-32 screw into the 3/16 inch hole.

May 23, 2007 ...  Today I started fitting the spar webs together, and Clecoed them in preparation of pre-drilling the spar caps. All of the spar web pieces come pre-made and (laser) pre-drilled and they all stack up flawlessly. It is really nice that I didn't have to make those and especially drill all of those holes! When fitting the spar caps, great caution must be taken to make sure the correct spar caps are being used. The two angles on top of the spar caps are not symmetrical. The steeper (7 degree) angle must go to the front on the top spar cap, and the more shallow (2 1/2 degree)angle goes to the back. On the lower spar caps the angle configuration is opposite of the top spar caps.