You totally right.The inherent issue with the HF grinders is they are cheaply made and thermo plastic is prone to flex, I'd never consider buying one when there are much better alternatives that don't need modified out there. I'm cheap but not that cheap. The other more important issue is the bastard sized wheels.
I should add that one, I don't use vitrified wheels at all, only plasma coated CBN wheels that are coated on aluminum discs so zero imbalance and they never need dressed, just cleaned infrequently and will last many, many loops. In fact, I've run well in the excess of 150 20" loops to date and the wheels look like new.
and.. I have 2 chain grinders, one is the Tecomec / Oregon grinder and the other is an Amazonian special, aka: Vevor that is the exact copy of the Tecomec / Oregon grinder right down to the motor and chain vise and it was just under 100 bucks with free shipping. I will say the Vevor has a better depth stop than the Oregon has and I don't run the clunky shields on either as CBN wheels don't explode so they are not needed. The pivots on the Vevor are tight and there is no slop in them at all (I do keep both of them oiled anyway). Don't buy the bad reviews on the Vevor as whomever posted them is brain dead. I'm here to tell you none of them are even remotely accurate. I have a wide surface CBN wheel in the Vevor and all I do with it is set the rakers. It's canted over 60 degrees for that.
Shortly after buying the cheap mini grinder I found a better one for only a few bucks more.
In canada the princess auto tecomec/oregon clone is even cheaper then than the vevor off amazon.
I dont sharpen that many chains so im ok with the cheapie grinder for now.