It could just be the light, so just ignore me if it is, but those 2 skews look to have a hell of a hollow grind on them...so much so that I'd say they are not safe to use.
It's just painted on then washed off after a minute, it turns the oak a shade of pink initially which gradually darkens. I really like the effect.
I use slaked lime (calcium hydroxide).
I've just set mine to 15 degrees to have a look, and have a 3mm gap between the plate and the 120 grit ceramic belt. You could either change to a non diamond belt or see if you have a gap if you set it to 20 degrees, you'll probably find this angle a bit more user friendly anyway.
I have one after Helen Bailey recommended them during a demo at Axminster Nuneaton. I usually run mine on half power and probably get about 5 hours run time and not the 7 as advertised. I bought the extension and have it suspended from a dust filter above my lathe using the magnetic base. My...