since you lost the allen bolt and maybe the piece that was inside with it, just use the normal geisha washers/shims. they should fit. I thought they did anyway?
i didnt have the 14 mm easy-adjusting axle in my federal v2 long enough for the internal bolt to decide to fall out, but looking at it now.. it is real easy to turn in there.. (I went with the 3pc axle conversion right away)
threadlock the bolt if you can get a new one.