Working on a sword blade, and I wanted to run some fuller. Since I have never done that before, I wasn't 100% sure how. I don't have any stages or fullering tools, so I opted for grinding in. However.... my option were an underpowered belt sander, or an angle grinder. 

I didn't want to OOPS and destroy a project with the angle grinder, so, I started with a dremel, cut a start groove, moved onto a stone grinding tip, then a sanding tip. Once the fuller was significantly large/straight/deep enough, I needed to find a way to expand it, but still maintain control.... so, I built a tool. 

It runs in a cordless drill chuck, and I can control/apply pressure with my off hand due to a grip I added. Allowed me to sand/grind the fuller better and maintain control, with minimal damage if I slipped. 

one problem with using the wheel that way is the wheel changes shape as you grind, which means so does your fuller channel

True, but, for now, It is what I have.