One thing I tried that worked on my first hand thinning project was to get the 3-4" wide sanding belts for a handheld belt sander in a couple different
I used this one, I haven't used my oven too much to back or anything since I got it, but I was able to keep the temp right on and then blast it with convection
The bolster/ handle definitely says Mareko to me.
An apology to start. I know many (most) of you are free hand sharpeners. I tried, but now am using an Edge Pro. Maybe some day I'll try free hand again.
Deff. take some elbow grease to do it by hand. Do you own a coarse diamond plate? Trying to do it on coarse stones will wear them down quite a bit. You