Those tri hone set ups were made by Norton.
I use WD 40 to float off the tiny steel chips, that is all the oil does, it does not make the stones cut better just keep it clean. That's why there were bathed in oil, turn the hones cleans them.
The mini belt grinder works fine, I am just at places were there is no electric at times. If I need to touch up the edge when I am not around a stone, roll your truck window down and where the side window is "frosted" on top, pull you knife blade backwards. It is just a big diamond hone.