Rolled fretboard edge

[Bruce Johnson]

I think you're right. Here's the Amazon wheel he posted a link to previously...not a "combi" wheel at all. Looks like he either confused links, or Amazon switched something along the way.
https://www.amazon.com/3M-Scotch-Br...TF8&qid=1519460573&sr=1-3&keywords=flap+wheel

Yes, that is not what I recommend for rounding off frets!

 

[Iridescentone]

Okay, I have an upcoming edge rounding job, and I'm going to try the flap technique this time. I looked through all my tool boxes...no combi-flap to be found. Time to buy one just for this job. Well they come in various grits, diameters, and brands. I'm pretty high on 3M products in general, but at $40 ea...

So, here's a couple links to some non-3M choices from Amazon. Assorted variety packs, individual wheels with choice of grits and diameters, and for a whole bunch less dineros than 3M. Good enough for rock 'n roll?...maybe. Might grab an assortment pack, we'll see.

Amazon.com: BHA Aluminum Oxide Shank Mounted Flap Wheels, 1-1/2” x 1” x 1/4”, 40 Grit - 5 Pack : Industrial & Scientific
Amazon.com: 40 Pack 1/4" Abrasive Flap Wheel Sander Set, Rocaris 80 Grit Aluminum Oxide Flap Wheels Cylindrical Shape Sanding Wheel, 8 Sizes : Industrial & Scientific
Amazon.com: Mixiflor 20 Pcs 5 Sizes 60/80/120/240 Grits Abrasive Flap Wheel Sander, 1/4 Inch Shank Flap Wheels for Drill, Die Grinder Flap Wheel,Flap Wheel Sander for Drill : Industrial & Scientific
Amazon.com: 14 Pack Rocaris Buffing Flap Wheels - 7 Size Flap Disk - 1/4 Inch Shanks Fit All Drills - 80 Grits : Industrial & Scientific