The main spar bolts on the ES have nylon lock nuts.

See, Mike, there's the difference.  The mighty LNC2 sends a drilled head bolt thru bushings in the spars and thence into the largest nut plate (nut welded to plate, not nyloc) you might see this side of a battle ship (the nut plate is hidden behind the completely opaque secondary spar web. 

 

It would seem important to secure that bolt head with safety wire.

 

It is now known that Larry is concerned with a LNC2 and, thus Jeff (N273CK, still building) is quite correct that Lancair directs two flat head machine screws thru the spar web (and the imbedded aluminum) to help distribute load stress - the original directions had one placed so that it blocked the aileron intermediate push rod near BL50.  Thus, some of us had to move one of the screws if we were too quick to place them on our slow built craft while fast build kits should have them properly located.  You can see that even the vintage (kit year) and style (slow/fast build) is relevant and important info. 

 

Additionally, on the big spar-bolt head side, one of the flat head screw nuts should be securing a safety wire lug (supplied if you purchased the "hardware" option, otherwise, BYO).  In the cockpit, this is available from the front of the wing spar (about BL18) and easily accessible.  The other one is in the wheel well just inboard of the BL50 rib on the main spar - usually requiring the hands of a small child or other dwarf indentured servant to hook up the wire.

 

These two stink'n bolts keep us from flapp'n da wings. 

 

 

 

And a Bit of Baling Wire.