Motor speed controller for Kally 1SM?

[pjwoolw]

I've been using Kallys for many years, and have two methods of effectively "slowing down" the grinder.

This is going to sound simplistic, but the less pressure you use, the slower the machine works.  

When using a lightweight finishing belt, I run it on top of a worn out heavy belt so I have a flatter, more precise surface. It's easier to achieve precise pressure, especially on the edges of a lightweight finishing belt. I also use a heavy belt under leather, to eliminate "flutter". The more precisely the belt runs, the easier it is to use no pressure.

Even slower? I don't turn the machine on. I "strop" the blade on the stationary belt, just by drawing the blade from bottom to top. 

I finish edges using either method.

Bingo!

I suppose all this variable speed stuff has advantages but I've never been able to talk myself into it. That much time and money, for me, would be better invested in a 2x72. I really don't need one of those either but it would be fun.

So what do you all gain be going variable speed on such a small unit? There isn't enough torque at low speeds to do anything heavy. Just trying to understand a little better what the goal / benefit is. Bang for the buck, etc.