I thought there was a small engine repair guy in Mass that sharpened Nils auger heads too, but can't find the link. I've used Frank in MN before. Speedy, top-notch work.
Here's more info:
"Looking for a closer, faster avenue to get that Nils blade sharpened? Look no further.
Nils Master Blade Sharpening
UPDATE: Surface Tension is now and Authorized by Nils Master to sharpen and reset Nils blades.
Surface Tension will be offering Sharpening for Nils Master Auger blades.
He knows the importance of getting your auger back in service and will do all he can to get your blades back to you ASAP.
Cost will $20 plus return shipping.
Blade removal:
To help the removal of blade,
warm the area where the stub meets
the auger shaft to melt any ice.
Remove the retaining bolt and with a rubber or wooded mallet
tap the blade to rotate it off the shaft.
Do this on the radius above the cutting edges.
Do not bend the blade.
Shipping Instructions:
Ship blade with guard on and pack box with packing material.
Include return Name and address and email address in
case I need to get a hold of you. I'll also email you when your blade is shipped back to you.
Please use the United States Postal Service
Include payment for return shipping, which should be the same as what it cost to ship to me.
You'll be getting your blade back.
Use a permanent ink pen and write your name on your blades for your own piece of mind.
If your blade is bent or had been previously sharpened incorrectly, chances are they won't be any good.
Those blades will be returned back to you minus shipping and handling.
Frank DeLuca
5382 Jentoft Rd,
Saginaw, MN
55779
frankbdeluca@yahoo.com"