While you are at HF..pick up the packs of 6 hard felt 2"diameter wheels. For much of the razor work, especially cleaning against the inside of the spine they are really good. That is where a long shaft and adapter are worth the effort. The surface speed will be lower and less apt to destroy the temper if you are not very careful. Still... watch the temperature of the blade!!!

Use a piece of steel or the back of an exacto knife blade to roughen the cutting surface a bit, while spinning on the buffer, before applying compound. That will center the buff/mop and make a surface the compound can attach and meld with. Using snadpaper may leave some bits of abrasive.
I have found four inch stitched buff in four packs cheaply ofn the 'bay. They are "hard" cutting buffs. Use a soft buff to polish.