Axle nut solution - Nord lock with part #s
Nordlock makes an M27 washer that is 1.9" wide - the nordlock part # is NP27SP or 1551. Grainger sells them for 12.89 apiece. The Part# on Grainger is 12W476 http://www.grainger.com/product/NORD...-Washer-12W476
Note: Even though the axle is an m27, the washer is a bit larger. To get it centered on the axle, you can tighten the axle nut until it is just barely holding the washer against the hub, then used a flathead screwdriver to center it with the nut before tightening down all the way.
Also mark the nuts to note any future movement.
I hope this helps some folks out!
Nord-Lock Steel Wedge Lock Washers, Bolt Size: M27, OD: 1.91", Enlarge OD, Thru Hard Steel w/ Zinc Delta Protekt Coat, NORD NL27-SP/1551 - 1 Pairs/PK
Nord-Lock Steel Wedge Lock Washers, Bolt Size: M27, Outer Diameter: 1.91", Enlarged Outer Diameter, Through Hardened Steel with Zinc Flake Delta Protekt® Coating, NORD NL27-SP/ ...
See more details at Tanner »
$6.73
+$6.50 shipping. No tax
Tanner
That price is half of Grainger's for Zinc coated carbon steel. Or $27 + change to get the 316SS version, thats what I use.
Where I live in Oahu, Grainger will charge me higher shipping + tax.
Tannerbolt only charge me USPS Flate Rate Box and no tax.
HTH someone!
also nordlocking is supposed to be more reliable than the double nut techique. Here is a video testing various methods of fastener use:

EDIT:
forgot to note that nordlocks are reuseable











