The Harbor Freight models don't look the same as the one from GB.
Do you have a HF model number of the one you have?
Thanks,
Charlie
There is too much run out for carbide bits. It works well with steel bits. The chuck will hold .020 or 0.5mm drill bits or larger bits.
My speed control quit working. So I wired it as a switch. So mine operates as a single speed motor, but it has variable speed adjustment with the belt pulleys.