I bought one of those Speed Blaster sandblasting guns awhile back and it works great! Have been blasting the interior window garnish trim and all that rust comes off like a charm to reveal new metal like it was at the factory.
Also great for bolts and washers, etc.
The only down side to the Blaster is the small hopper that has to be filled when empty.
It may be overkill, but I came up with the contraption in the attached photos. Works like a charm!
Takes about two seconds to refill the hopper and you're blasting again.
The problem, as I saw it, was to elevate the five gallon pail high enough to fill the Blaster hopper easily.
But that pail gets heavy with media in it, so there had to be a way to fill the pail at ground level and then raise it for use while blasting.
I think it is self-explanatory how it works.