Left HS upper trailing edge, 11th rivet outbd. Looks like the dimpler got away from the original builders and they punched an extra hole in the skin here. Their solution was to drill and dimple the aft spar flange here and install a rivet in both holes. Not only does it look goofy, there's no way I have min. pitch between rivets, although I think I'm good on distance to the radius of the spar flange. I suspect that the skin will eventually crack between these two rivets. My initial reaction is to replace that skin as well as that half of the aft HS spar, especially since I'll have to drill out the root ribs to comply with the elevator service bulletin anyway, but I don't know how much of a problem it will be to match up a new match drilled but undimpled skin to the existing dimpled ribs. I emailed Vans to see what their builder support guys thought and haven't gotten a reply yet. If they say "use as is, no problem" I'm going to have to think long and hard about whether to go that route and save myself some work or drill it all apart and fix it just because I don't like the way it looks. SB14-01-31 Installs some doublers behind the center section of the main HS spar to deal with potential cracking from the relief holes at the corners of the spar where the flange has been removed in the center section. I'm definitely doing this while I've got the H/S laying on a bench unpainted. When the Original guys removed the center spar flanges per print, they didn't completely get rid of them. There's still about 1/4" of flange inbd of the relief hole for a distance of about 3/4". I don't think it will hurt anything, so I'll likely leave it unless it interferes with the doubler plates or Van's tells me that it's a problem for some other reason. Since I was already reaching out to them re the other issue, I asked them about that as well. Here's a cut and paste of part of the email that I sent to them on 9-10-19. Waiting for a response before I ordered the SB kit, to decide if I want to order a new skin and left rear spar at the same time and save myself some shipping $. The dimpler got away from them and punched a hole through the upper skin near the 11th AN426AD3-3.5 rivet out from the inbd end on the LH trailing edge. Their solution was to drill & dimple both holes and install two rivets in that location. Both rivets go through the skin & HS-603PP. Rivet pitch is only about 7/32��and the mistake rivet is 1/4��aft of the upper flange radius for the HS-603PP. I think I'm good on the distance from the radius, but nowhere near good enough on rivet pitch (is it supposed to be 3d minimum?). Questions: 1. Use as is? 2. Put a doubler behind the spar web 3. It looks pretty micky mouse, and I imagine it will crack sooner or later, so my inclination is to order a new skin & left HS-603PP, and reskin it. I understand I might scrap some parts if I oversize holes, but assuming I don't, what sort of problems am I likely to face match drilling a new skin to dimpled ribs? I don't have a problem ordering new LH ribs as well if that stands a better chance of getting a descent fit. Issue 2: I would like to go ahead and comply with SB14-01-31. Looking at the HS-702 inbd end, the flanges haven't been completely removed per HS-702 Front Spar Tab Detail. A partial flange extends about 22/32��inbd from the 1/4��relief hole at all 4 locations. Question: 1. Will these flanges interfere with the SB plates or otherwise cause a problem? I'm inclined to leave them alone unless you tell me I need to remove them.