I'll see if I can find it, but I don't use facebook. Request Rans put their recommendation here.

m.whiting, Same issue here - Just clamped my parts together after I saw your post.

Just out of curiosity, what are you priming with? I primed the rudder spars and ribs with some of the NAPA self-etching stuff that I see people talking about on the forums.

For what it's worth, here's what I did: The manual has a "Typical hardware drill size table" that shows a #11 bit is used for an AN-3. I drilled the center (top) hole up to a #11 and then temporarily attached the part to the spar. From there, I could use a standard 3/16's bit through the rudder spar mount tube without contacting the powder coat or touching the mount tube hole bosses. I used this as a guide to enlarge the holes in the spar for the AN3's. Although a #11 is spec'd for the bolts, the 3/16's allowed them to fit fine after drilling and deburring. Hopefully some of the Rans guys will jump back into the forum soon. Sounds like we are both just starting out - I'll be interested to keep up and see how yours is progressing! Ryan