Hi, i just ordered a Turin SD40 grinder and i was wondering if anyone here was able to successfully lower the speed of this grinder a bit?

I found good infos for the stepless mods on the forum but not much about lowering the speed.

I thought about using a controller like this but i presume speed cant be lowered that much anyway if we want to keep decent torque.

https://www.amazon.ca/gp/product/B08R7BFL6V/

Any input would be appreciated.

Thanks!