You couldnt ask for better guys than ameribrade. Seriously call them and they will answer any of your questions. I bought just a chassis from them when they were first getting started but already had a motor and vfd. my motor however did not have a foot on it. So I had to make a bracket to mount the motor to, then mount bracket to chassis of ameribrade. I tinkered with it for weeks. Couldnt afford to get a new motor at the time. I asked them if they could do a refund almost 2 months later and grinder had been used. They said no problem and even paid for shipping back to them.
The grinder ran amazing, and I liked the way you can hold the tracking wheel down to change belts. The welds on it were gorgeous. Powder coat was great. Work rest was super intuitive. Their new fast back is even better by my standards as welds can lead to some warping as heat does that sometimes.
I have a northridge now, however if I needed a second Ameribrade would be my choice. Jump on instagram and just scroll through their page. They keep upgrading machines(to make more grinders) and expanding fixtures and accessories for their grinder.
If I were to rank grinders, and Ive used about them all at this point.
Northridge
Ameribrade
Kadrmas
BurrKing/tw90
Bader/esteem/reeder
brodbeck( I have no first hand experience, however I dont like how they gave away a BUNCH of grinders) and now the makers who got them for free are saying how great they are.
wayyyyy down here
Kmg(used to be great, then quality dropped drastically. I think they are trying to rebuild, new owner but I had a real bad taste from my dealings)
oregon blade maker(like to steal other grinders designs while those grinders are in process of patent. Garbage ethics)